v3.10.0.1

Income Taxes (Schedule of Provision for Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Taxes [Abstract]
Federal income taxes	$ 13.6	$ 17.2	$ 41.4	$ 62.1
State income taxes, net of federal income tax benefits	1.4	1.2	4.4	2.7
Deferred tax benefit for tax accounting method change	(23.6)		(23.6)
Impairment losses and other non-operating adjustments	(9.5)	8.7	(24.9)	22.2
Accelerated vesting of certain stock-based awards	(1.6)		(1.6)
Other items, net	0.3	(1.8)	4.4	(5.3)
(Benefit) provision for income taxes	$ (19.4)	$ 25.3	$ 0.1	$ 81.7

Accelerated Vesting of Certain Stock-Based Awards, Income Tax Expense (Benefit)

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- Definition

Impairment Losses and Other Non-Operating Adjustments, Income Tax Expense (Benefit)

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No definition available.

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- Definition

Amount of current and deferred federal income tax expense (benefit) attributable to income (loss) from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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Amount of other current and other deferred income tax expense (benefit) attributable to continuing operations.

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Amount of state and local current and deferred income tax expense (benefit) attributable to continuing operations.

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