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Derivative Financial Instruments - Location and Amount of Fair Value Hedge Derivative Gains and Losses Recorded in Income (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]        
Interest Income $ 2,499.9 $ 1,406.5 $ 1,643.5 $ 2,499.9
Interest Expense 822.0 23.8 200.3 822.0
Other Operating Income 145.5 243.9 194.0 $ 145.5
INTEREST INCOME        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gains (losses) recognized on fair value hedges 21.2 (16.2) (13.2)  
Total gain/(loss) recognized on cash flow hedges 25.9 10.5 27.9  
INTEREST EXPENSE        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gains (losses) recognized on fair value hedges 5.2 57.1 29.9  
Total gain/(loss) recognized on cash flow hedges 0.0 0.0 0.0  
OTHER OPERATING INCOME        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gains (losses) recognized on fair value hedges 0.0 0.0 0.0  
Total gain/(loss) recognized on cash flow hedges 0.8 (6.0) 0.2  
Interest Rate Contracts | INTEREST INCOME        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest Rate Contracts, Recognized on Derivatives (95.9) 39.1 (66.3)  
Interest Rate Contracts, Recognized on Hedged Items 95.9 (39.1) 66.3  
Interest Rate Contracts, Amounts Related to Interest Settlements on Derivatives 21.2 (16.2) (13.2)  
Total gain/(loss) recognized on cash flow hedges (0.5) 0.0 0.5  
Interest Rate Contracts | INTEREST EXPENSE        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest Rate Contracts, Recognized on Derivatives 99.4 (161.6) 100.2  
Interest Rate Contracts, Recognized on Hedged Items (99.4) 161.6 (100.2)  
Interest Rate Contracts, Amounts Related to Interest Settlements on Derivatives 5.2 57.1 29.9  
Total gain/(loss) recognized on cash flow hedges 0.0 0.0 0.0  
Interest Rate Contracts | OTHER OPERATING INCOME        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest Rate Contracts, Recognized on Derivatives 0.0 0.0 0.0  
Interest Rate Contracts, Recognized on Hedged Items 0.0 0.0 0.0  
Interest Rate Contracts, Amounts Related to Interest Settlements on Derivatives 0.0 0.0 0.0  
Total gain/(loss) recognized on cash flow hedges 0.0 0.0 0.0  
Foreign Exchange Contracts | INTEREST INCOME        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain/(loss) recognized on cash flow hedges 26.4 10.5 27.4  
Foreign Exchange Contracts | INTEREST EXPENSE        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain/(loss) recognized on cash flow hedges 0.0 0.0 0.0  
Foreign Exchange Contracts | OTHER OPERATING INCOME        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain/(loss) recognized on cash flow hedges $ 0.8 $ (6.0) $ 0.2