Stock Based Compensation - Stock Based Compensation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	$ 61.4	$ 50.8	$ 44.2
Income tax benefit	(10.8)	(10.5)	(14.4)
Total stock-based compensation expense	50.6	40.3	29.8
Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	39.5	30.5	26.9
Income tax benefit	(7.5)	(6.3)	(8.7)
Total stock-based compensation expense	32.0	24.2	18.2
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	21.9	20.3	17.3
Income tax benefit	(3.3)	(4.2)	(5.7)
Total stock-based compensation expense	$ 18.6	$ 16.1	$ 11.6

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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