Hedging Activities, Derivative Instruments and Fair Value Measurements - Fair Value Measurements (Details) - Recurring - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Financial Assets
Trading securities held in deferred compensation plan	$ 11.4	$ 12.0
Interest rate caps	9.5
Cross-currency interest rate swaps	21.4
Foreign currency forwards	0.0	0.0
Total	42.3	12.0
Financial Liabilities
Deferred compensation plans	18.7	22.4
Interest rate swaps	2.6
Cross-currency interest rate swaps	15.4
Foreign currency forwards	0.0	0.2
Total	36.7	22.6
Level 1
Financial Assets
Trading securities held in deferred compensation plan	11.4	12.0
Interest rate caps	0.0
Cross-currency interest rate swaps	0.0
Foreign currency forwards	0.0	0.0
Total	11.4	12.0
Financial Liabilities
Deferred compensation plans	18.7	22.4
Interest rate swaps	0.0
Cross-currency interest rate swaps	0.0
Foreign currency forwards	0.0	0.0
Total	18.7	22.4
Level 2
Financial Assets
Trading securities held in deferred compensation plan	0.0	0.0
Interest rate caps	9.5
Cross-currency interest rate swaps	21.4
Foreign currency forwards	0.0	0.0
Total	30.9	0.0
Financial Liabilities
Deferred compensation plans	0.0	0.0
Interest rate swaps	2.6
Cross-currency interest rate swaps	15.4
Foreign currency forwards	0.0	0.2
Total	18.0	0.2
Level 3
Financial Assets
Trading securities held in deferred compensation plan	0.0	0.0
Interest rate caps	0.0
Cross-currency interest rate swaps	0.0
Foreign currency forwards	0.0	0.0
Total	0.0	0.0
Financial Liabilities
Deferred compensation plans	0.0	0.0
Interest rate swaps	0.0
Cross-currency interest rate swaps	0.0
Foreign currency forwards	0.0	0.0
Total	$ 0.0	$ 0.0