Fair Value Measurements - Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets
Cash equivalents - money market funds	$ 1.1	$ 1.0
Deferred compensation plan assets	28.1	30.1
Total	34.4	43.7
Liabilities
Deferred compensation plan liabilities	22.1	26.4
Earn-out liabilities	16.7	13.6
Total	42.2	44.7
Level 1
Assets
Cash equivalents - money market funds	1.1	1.0
Deferred compensation plan assets	28.1	30.1
Total	29.2	31.1
Liabilities
Deferred compensation plan liabilities	22.1	26.4
Earn-out liabilities	0.0	0.0
Total	22.1	26.4
Level 2
Assets
Cash equivalents - money market funds	0.0	0.0
Deferred compensation plan assets	0.0	0.0
Total	5.2	12.6
Liabilities
Deferred compensation plan liabilities	0.0	0.0
Earn-out liabilities	0.0	0.0
Total	3.4	4.7
Level 3
Assets
Cash equivalents - money market funds	0.0	0.0
Deferred compensation plan assets	0.0	0.0
Total	0.0	0.0
Liabilities
Deferred compensation plan liabilities	0.0	0.0
Earn-out liabilities	16.7	13.6
Total	16.7	13.6
Interest rate swap agreements
Assets
Derivative asset	4.2	11.3
Liabilities
Foreign currency forward contracts	1.6	3.0
Interest rate swap agreements | Level 1
Assets
Derivative asset	0.0	0.0
Liabilities
Foreign currency forward contracts	0.0	0.0
Interest rate swap agreements | Level 2
Assets
Derivative asset	4.2	11.3
Liabilities
Foreign currency forward contracts	1.6	3.0
Interest rate swap agreements | Level 3
Assets
Derivative asset	0.0	0.0
Liabilities
Foreign currency forward contracts	0.0	0.0
Foreign currency forward contracts
Assets
Derivative asset	1.0	1.3
Liabilities
Foreign currency forward contracts	1.8	1.7
Foreign currency forward contracts | Level 1
Assets
Derivative asset	0.0	0.0
Liabilities
Foreign currency forward contracts	0.0	0.0
Foreign currency forward contracts | Level 2
Assets
Derivative asset	1.0	1.3
Liabilities
Foreign currency forward contracts	1.8	1.7
Foreign currency forward contracts | Level 3
Assets
Derivative asset	0.0	0.0
Liabilities
Foreign currency forward contracts	$ 0.0	$ 0.0