Stock-based Compensation - Summary of Restricted Stock and Performance Share Units Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of shares vesting	$ 14.6	$ 24.8	$ 9.9
Restricted Stock
Beginning Balance (In Shares)	589
Granted (In Shares)	225	248	375
Vested (In Shares)	(280)
Forfeited (In Shares)	(40)
Ending Balance (In Shares)	494	589
Weighted Average Fair Value
Beginning Balance (in dollars per share)	$ 34.18
Granted (in dollars per share)	54.28	$ 46.01	$ 29.27
Vested (in dollars per share)	30.96
Forfeited (in dollars per share)	44.45
Ending Balance (in dollars per share)	$ 44.33	$ 34.18
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of shares vesting	$ 22.1	$ 22.6	$ 7.9
Restricted Stock
Beginning Balance (In Shares)	799
Granted (In Shares)	248
Vested (In Shares)	(425)
Forfeited (In Shares)	(40)
Ending Balance (In Shares)	582	799
Weighted Average Fair Value
Beginning Balance (in dollars per share)	$ 33.11
Granted (in dollars per share)	54.27
Vested (in dollars per share)	29.89
Forfeited (in dollars per share)	41.27
Ending Balance (in dollars per share)	$ 43.93	$ 33.11

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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