Fair Value Measurements (Details) $ in Millions	Mar. 31, 2024 USD ($) contract	Dec. 31, 2023 USD ($) contract
Net Investment Hedging [Member]
Fair value of assets and liabilities measured on recurring basis
Number of forward contracts | contract	0	0
Cash Flow Hedging
Fair value of assets and liabilities measured on recurring basis
Number of forward contracts | contract	0	0
Fair value measurements recurring basis
Fair value of assets and liabilities measured on recurring basis
Short-term investments	$ 106.4	$ 185.2
Long-term investments	0.4	0.4
Forward contracts	(0.2)	(0.5)
Redeemable noncontrolling interests	(30.9)	(30.7)
Total asset	75.7	154.4
Fair value measurements recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair value of assets and liabilities measured on recurring basis
Short-term investments	0.0	0.0
Long-term investments	0.0	0.0
Forward contracts	0.0	0.0
Redeemable noncontrolling interests	0.0	0.0
Total asset	0.0	0.0
Fair value measurements recurring basis | Significant Observable Inputs (Level 2)
Fair value of assets and liabilities measured on recurring basis
Short-term investments	106.4	185.2
Long-term investments	0.4	0.4
Forward contracts	(0.2)	(0.5)
Redeemable noncontrolling interests	0.0	0.0
Total asset	106.6	185.1
Fair value measurements recurring basis | Significant Unobservable Inputs (Level 3)
Fair value of assets and liabilities measured on recurring basis
Short-term investments	0.0	0.0
Long-term investments	0.0	0.0
Forward contracts	0.0	0.0
Redeemable noncontrolling interests	(30.9)	(30.7)
Total liability	$ (30.9)	$ (30.7)