v3.7.0.1

Derivative Instruments (Details) - Interest rate swaps $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($) counterparty investment Investments	Jun. 29, 2017
Derivative [Line Items]
Derivative, term of contract	1 year
Cumulative deferred gain	$ 8.6
Derivative net gain (loss) to be reclassified	2.6
Assets needed for immediate settlement, aggregate fair value	$ 12.0
Minimum [Member]
Derivative [Line Items]
Derivative, variable interest rate	0.75%
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Number of derivative instruments held \| Investments	16
Derivatives, number Of additional counterparties \| counterparty	2
Derivative, number of additional instruments Held \| investment	8
Derivatives, number Of counterparties \| counterparty	4
Derivative, amount of variable interest-rate debt	$ 1,000.0
LIBOR [Member]
Derivative [Line Items]
Derivative instrument, variable interest rate, Term	1 month
Fixed Interest Rate [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Effective fixed interest rate on hedged variable interest rate debt	3.47%
Year 1 [Member]
Derivative [Line Items]
Derivative, average fixed interest rate	1.32%	0.85%
Year 2 [Member]
Derivative [Line Items]
Derivative, average fixed interest rate	1.59%	1.11%
Year 3 [Member]
Derivative [Line Items]
Derivative, average fixed interest rate	1.78%	1.39%
Year 4 [Member]
Derivative [Line Items]
Derivative, average fixed interest rate	1.94%	1.69%

Derivative Instrument, Variable Interest Rate, Term

+ References

No definition available.

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- Definition

Derivative, Number of Additional Instruments Held

+ References

No definition available.

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- Definition

Derivatives, Number Of Additional Counterparties

+ References

No definition available.

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- Definition

Derivatives, Number Of Counterparties

+ References

No definition available.

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- Definition

Effective fixed interest rate on hedged variable interest rate debt

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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- Definition

Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective fair value hedge that is amortized upon discontinuation of the fair value hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 35
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=82917030&loc=d3e75592-113984

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- Definition

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

+ References

No definition available.

+ Details

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

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- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

+ References

No definition available.

+ Details

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