Fair Value Measurements (Details) $ in Millions	Sep. 30, 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	$ 20.3	$ 185.2
Long-term investments	1.3	0.4
Forward contracts	2.6
Forward contracts		(0.5)
Redeemable noncontrolling interests	(20.7)	(30.7)
Total asset	3.5	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
Forward contracts		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	20.3	185.2
Long-term investments	1.3	0.4
Forward contracts	2.6
Forward contracts		(0.5)
Redeemable noncontrolling interests	0.0	0.0
Total asset	24.2	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
Forward contracts		0.0
Redeemable noncontrolling interests	(20.7)	(30.7)
Total liability	$ (20.7)	$ (30.7)