v3.26.1
Fair Value Measurements (Details)
$ in Millions
1 Months Ended 3 Months Ended
Aug. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
contract
Jun. 30, 2026
USD ($)
Fair value of assets and liabilities measured on recurring basis      
Cumulative loss before tax   $ 88.0  
Cumulative after-tax loss   $ 67.4  
Net investment hedging      
Fair value of assets and liabilities measured on recurring basis      
Number of foreign exchange forward contracts | contract   0  
Cash flow hedging      
Fair value of assets and liabilities measured on recurring basis      
Number of foreign exchange forward contracts | contract   0  
Treasury Lock With 10 Year Term | Cash flow hedging      
Fair value of assets and liabilities measured on recurring basis      
Aggregate value of net derivative instrument $ 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 net derivative instrument $ 1,000.0    
Derivative instruments period (in years) 30 years    
4.625% Senior Notes Due February 2036      
Fair value of assets and liabilities measured on recurring basis      
Stated interest rate (as a percent)   4.625%  
5.300% Senior Notes Due November 2055      
Fair value of assets and liabilities measured on recurring basis      
Stated interest rate (as a percent)   5.30%  
Fair value measurements recurring basis      
Fair value of assets and liabilities measured on recurring basis      
Short-term investments   $ 303.6 $ 689.7
Long-term investments   0.2  
Forward contracts   0.3 (15.3)
Redeemable noncontrolling interests   (9.3) (9.0)
Total asset   294.8 665.4
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  
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   303.6 689.7
Long-term investments   0.2  
Forward contracts   0.3 (15.3)
Redeemable noncontrolling interests   0.0 0.0
Total asset   304.1 674.4
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  
Forward contracts   0.0 0.0
Redeemable noncontrolling interests   (9.3) (9.0)
Total liability   $ (9.3) $ (9.0)