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Derivative Instruments and Hedging Activities - Narrative (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Swap
position
contract
derivative
Dec. 31, 2022
USD ($)
contract
Swap
position
Dec. 31, 2021
USD ($)
contract
position
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, net liability position, aggregate fair value $ 16.9    
Cash collateral received $ 18.3    
Designated as Hedging Instrument | Interest rate swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Reclassification, cash flow hedge, after tax     $ 25.9
Not Designated as Hedging Instrument | Minimum      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative expiration period 30 days    
Not Designated as Hedging Instrument | Maximum      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative expiration period 60 days    
Not Designated as Hedging Instrument | Interest rate swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative notional amount $ 1,200.0 $ 1,300.0  
Number of interest rate swaps | Swap 132 141  
Not Designated as Hedging Instrument | Interest rate caps      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative notional amount $ 55.6 $ 245.8  
Number of interest rate swaps | Swap 2 12  
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Number of contracts terminated | contract     4
Derivative notional amount     $ 850.0
Number of interest rate swaps | contract 0 0  
Fair Value Hedging | Designated as Hedging Instrument | Interest rate swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Number of contracts terminated | position 2 13 8
Derivative notional amount $ 472.5 $ 22.5  
Number of interest rate swaps | position 6 3  
Notional amount of interest rate derivatives entered into during the period $ 1,000.0    
Fair Value Hedging | Designated as Hedging Instrument | Terminated interest rate swap      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative notional amount $ 550.0 $ 58.0 $ 191.8
Fair Value Hedging | Designated as Hedging Instrument | Interest rate contract      
Derivative Instruments, Gain (Loss) [Line Items]      
Number of interest rate derivatives entered into during the period | derivative 5    
Notional amount of basis adjustments $ 4.6