Fair Value Measurements (Details) $ in Millions	1 Months Ended
	Aug. 31, 2025 USD ($)	Sep. 30, 2025 USD ($) contract	Dec. 31, 2024 USD ($) contract
Net Investment Hedging
Fair value of assets and liabilities measured on recurring basis
Number of foreign exchange forward contracts | contract		0	0
Cash Flow Hedging
Fair value of assets and liabilities measured on recurring basis
Number of foreign exchange forward contracts | contract		0	0
Treasury Lock With 10 Year Term | Cash Flow Hedging
Fair value of assets and liabilities measured on recurring basis
Aggregate value of notional treasury lock derivative instruments	$ 1,500.0
Derivative instruments period (in years)	10 years
Treasury Lock With 30 Year Term | Cash Flow Hedging
Fair value of assets and liabilities measured on recurring basis
Aggregate value of notional treasury lock derivative instruments	$ 1,000.0
Derivative instruments period (in years)	30 years
Fair value measurements recurring basis
Fair value of assets and liabilities measured on recurring basis
Short-term investments		$ 88.8	$ 18.4
Long-term investments		0.2	0.3
Forward contracts		(34.3)	(1.1)
Redeemable noncontrolling interests		(10.2)	(8.7)
Total asset		44.5	8.9
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		88.8	18.4
Long-term investments		0.2	0.3
Forward contracts		(34.3)	(1.1)
Redeemable noncontrolling interests		0.0	0.0
Total asset		54.7	17.6
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		(10.2)	(8.7)
Total liability		$ (10.2)	$ (8.7)