v3.20.4

Share-Based Compensation Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan percent of stock price at closing date	85.00%
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Numbers of shares issued	785,557	644,637	564,073
Restricted stock awarded estimated fair value	$ 29.3	$ 23.7	$ 26.1
Award vesting period	3 years
Total unrecognized compensation expense	$ 22.1
Weighted average period unrecognized compensation expense will be recognized	1 year 7 months 6 days
PBRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Numbers of shares issued	385,053	219,026	408,097
Restricted stock awarded estimated fair value	$ 15.9	$ 8.2	$ 19.2
Total unrecognized compensation expense	$ 14.5
Weighted average period unrecognized compensation expense will be recognized	1 year 8 months 12 days
PBRSU's Without Market-based Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Numbers of shares issued	5,260	15,562	232,225
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense	$ 0.0
Intrinsic value of options exercised	$ 18.2	$ 1.6	$ 14.3

Employee Stock Purchase Plan Percent of Stock Price At Closing Date

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.

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