Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income before income taxes:
United States	$ 406.7	$ 360.8	$ 354.7
International	113.8	106.2	88.4
Income before income taxes	520.5	467.0	443.1
Provision for income taxes — current:
Federal	65.0	12.3	164.1
State	16.6	21.8	15.3
International	25.4	17.8	28.1
Total provision — current	107.0	51.9	207.5
Provision for income taxes — deferred:
Federal	8.6	35.0	(10.4)
State	0.5	9.4	(0.9)
International	(3.0)	4.6	(3.0)
Total provision — deferred	6.1	49.0	(14.3)
TOTAL PROVISION FOR INCOME TAXES	$ 113.1	$ 100.9	$ 193.2