Stock Based Compensation - Stock Based Compensation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	$ 77.4	$ 62.6	$ 52.5
Income tax benefit	(12.9)	(9.7)	(9.4)
Total stock-based compensation expense	64.5	52.9	43.1
Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	48.6	38.6	34.1
Income tax benefit	(7.9)	(6.0)	(6.6)
Total stock-based compensation expense	40.7	32.6	27.5
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	28.8	24.0	18.4
Income tax benefit	(5.0)	(3.7)	(2.8)
Total stock-based compensation expense	$ 23.8	$ 20.3	$ 15.6

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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