Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Recurring
Financial Assets
Foreign currency forwards	$ 2.9	$ 0.5
Trading securities held in deferred compensation plan	9.1	7.3
Total	12.0	7.8
Financial Liabilities
Foreign currency forwards	0.7	0.5
Interest rate swaps		13.1
Deferred compensation plan	25.7	7.3
Total	26.4	20.9
Level 1 | Recurring
Financial Assets
Foreign currency forwards	0.0	0.0
Trading securities held in deferred compensation plan	9.1	7.3
Total	9.1	7.3
Financial Liabilities
Foreign currency forwards	0.0	0.0
Interest rate swaps		0.0
Deferred compensation plan	25.7	7.3
Total	25.7	7.3
Level 2 | Recurring
Financial Assets
Foreign currency forwards	2.9	0.5
Trading securities held in deferred compensation plan	0.0	0.0
Total	2.9	0.5
Financial Liabilities
Foreign currency forwards	0.7	0.5
Interest rate swaps		13.1
Deferred compensation plan	0.0	0.0
Total	0.7	13.6
Level 3 | Recurring
Financial Assets
Foreign currency forwards	0.0	0.0
Trading securities held in deferred compensation plan	0.0	0.0
Total	0.0	0.0
Financial Liabilities
Foreign currency forwards	0.0	0.0
Interest rate swaps		0.0
Deferred compensation plan	0.0	0.0
Total	0.0	0.0
Tradenames
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Carrying value of indefinite lived assets	$ 1,933.1	$ 614.3