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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss Attributable to Controlling Interests (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]  
Beginning balance $ 20,179.6
Ending balance 23,236.9
Accumulated Other Comprehensive Loss  
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]  
Beginning balance (1,151.1)
Net change in period 569.8
Ending balance (581.3)
Pension Liability  
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]  
Beginning balance (23.2)
Net change in period (6.8)
Ending balance (30.0)
Foreign Currency Translation  
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]  
Beginning balance (1,232.8)
Net change in period 586.1
Ending balance (646.7)
Fair Value of Derivative Investments  
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]  
Beginning balance 104.9
Net change in period (9.5)
Ending balance $ 95.4