Fair Value Measurements - Fair Value Measurements (Details) - Recurring - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Financial Assets
Trading securities held in deferred compensation plan	$ 15.3	$ 12.3
Interest rate swaps	16.5	14.1
Interest rate caps	21.0	18.1
Cross-currency interest rate swaps	15.6	17.7
Foreign currency forwards	0.0	0.0
Total	68.4	62.2
Financial Liabilities
Deferred compensation plans	21.9	19.6
Cross-currency interest rate swaps	48.8	28.7
Contingent consideration	62.5	43.9
Foreign currency forwards	0.0	0.0
Total	133.2	92.2
Level 1
Financial Assets
Trading securities held in deferred compensation plan	15.3	12.3
Interest rate swaps	0.0	0.0
Interest rate caps	0.0	0.0
Cross-currency interest rate swaps	0.0	0.0
Foreign currency forwards	0.0	0.0
Total	15.3	12.3
Financial Liabilities
Deferred compensation plans	21.9	19.6
Cross-currency interest rate swaps	0.0	0.0
Contingent consideration	0.0	0.0
Foreign currency forwards	0.0	0.0
Total	21.9	19.6
Level 2
Financial Assets
Trading securities held in deferred compensation plan	0.0	0.0
Interest rate swaps	16.5	14.1
Interest rate caps	21.0	18.1
Cross-currency interest rate swaps	15.6	17.7
Foreign currency forwards	0.0	0.0
Total	53.1	49.9
Financial Liabilities
Deferred compensation plans	0.0	0.0
Cross-currency interest rate swaps	48.8	28.7
Contingent consideration	0.0	0.0
Foreign currency forwards	0.0	0.0
Total	48.8	28.7
Level 3
Financial Assets
Trading securities held in deferred compensation plan	0.0	0.0
Interest rate swaps	0.0	0.0
Interest rate caps	0.0	0.0
Cross-currency interest rate swaps	0.0	0.0
Foreign currency forwards	0.0	0.0
Total	0.0	0.0
Financial Liabilities
Deferred compensation plans	0.0	0.0
Cross-currency interest rate swaps	0.0	0.0
Contingent consideration	62.5	43.9
Foreign currency forwards	0.0	0.0
Total	$ 62.5	$ 43.9