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Stock-Based Compensation - Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock-based compensation
Total fair value of units vested	$ 14.8	$ 17.3	$ 8.6
Number of shares
Unvested at beginning of period (in shares)	988	695
Granted (in shares)	683	674
Vested (in shares)	(360)	(310)
Canceled/forfeited (in shares)	(126)	(71)
Unvested at end of period (in shares)	1,185	988	695
Weighted average grant date fair value
Unvested at beginning of period (in dollar per share)	$ 40.82	$ 54.40
Granted (in dollar per share)	58.20	33.69
Vested (in dollar per share)	41.12	55.96
Canceled/forfeited (in dollar per share)	52.93	39.03
Unvested at end of period (in dollar per share)	$ 49.65	$ 40.82	$ 54.40
Vesting based on performance
Number of shares
Unvested at end of period (in shares)	176

X

- Definition

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

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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 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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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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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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