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Summary of Significant Accounting Policies Derivatives Pretax Amounts Affecting Income and Other Comprehensive Income (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 31.1
Cash Flow Hedging [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in AOCI (25.1) 206.4
Gain (loss) reclassified into income from AOCI 21.1 134.9
Net Investment Hedging Relationships    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in AOCI (395.1) 890.8
Gain (loss) reclassified into income from AOCI  
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion) 25.8 11.2
Interest rate | Cash Flow Hedging [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in AOCI 14.6 83.9
Gain (loss) reclassified into income from AOCI 0.9 (2.9)
Total Other Currencies | Net Investment Hedging Relationships    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in AOCI (435.2) 902.8
Gain (loss) reclassified into income from AOCI  
Foreign currency    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 4.3 9.3
Foreign currency | Cash Flow Hedging [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in AOCI (39.7) 122.5
Gain (loss) reclassified into income from AOCI 20.2 137.8
Foreign currency derivatives | Net Investment Hedging Relationships    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in AOCI 40.1 (12.0)
Cross Currency Interest Rate Contract [Member] | Net Investment Hedging Relationships    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion) 25.8 11.2
Equity    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 26.8 $ (9.3)