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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Derivative                
Aggregate fair value of all derivative instruments with credit risk-related contingent features in a liability position $ 35.4   $ 35.4     $ 59.7    
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net     0.6          
Approximate amount of net deferred gains on derivative instruments expected to be amortized during the next twelve months     53.4          
Component of Derivative Gain (Loss) Excluded from the Assessment of Hedge Effectiveness 0.4 $ (10.2) 10.6 $ 14.1        
Discontinued Hedge Accounting Due to Instrument No Longer Qualifying as Fair Value Hedge     0.0 0.0        
Derivative, Notional Amount 905.9 721.6 905.9 721.6 $ 919.1 744.4 $ 931.4 $ 881.4
Notional Amount Of Derivatives Additions 29.7 43.1 492.9 95.1        
Notional Amount Of Derivatives Terminations 42.6 253.3 331.3 254.6        
Credit Risk Contract | Credit Default Swaps                
Derivative                
Derivative, Notional Amount 11.6 11.1 11.6 11.1 11.9 11.7 10.7 11.4
Notional Amount Of Derivatives Additions 0.0 0.0 0.0 0.0        
Notional Amount Of Derivatives Terminations 0.0 0.0 0.0 0.0        
Credit Risk Contract | Credit Default Swaps | Not Designated as Hedging Instrument                
Derivative                
Derivative, Notional Amount 11.6   11.6     11.7    
Forwards                
Derivative                
Derivative, Notional Amount 23.5 10.3 23.5 10.3 28.1 11.9 7.6 8.9
Notional Amount Of Derivatives Additions 27.5 2.7 322.2 2.7        
Notional Amount Of Derivatives Terminations 32.1 0.0 310.6 1.3        
Forwards | Not Designated as Hedging Instrument                
Derivative                
Derivative, Notional Amount 23.5   23.5     11.9    
Forwards | Cash Flow Hedging | Designated as Hedging Instrument                
Derivative                
Notional Amount Of Derivatives Additions     250.0          
Notional Amount Of Derivatives Terminations     250.0          
Derivative, Loss on Derivative     1.2          
Total Return Swap | Not Designated as Hedging Instrument                
Derivative                
Derivative, Notional Amount 83.0   83.0          
Receive Fixed/Pay Fixed | Interest Rate Swaps                
Derivative                
Derivative, Notional Amount 787.8 700.2 787.8 700.2 798.3 720.8 663.1 611.1
Notional Amount Of Derivatives Additions 0.0 40.4 87.7 92.4        
Notional Amount Of Derivatives Terminations 10.5 3.3 20.7 3.3        
Receive Fixed/Pay Fixed | Interest Rate Swaps | Not Designated as Hedging Instrument                
Derivative                
Derivative, Notional Amount 148.2   148.2     148.2    
Receive Fixed/Pay Fixed | Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument                
Derivative                
Derivative, Notional Amount 189.7   189.7     210.2    
Receive Fixed/Pay Fixed | Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument                
Derivative                
Derivative, Notional Amount 449.9   449.9     362.4    
Receive Fixed/Pay Variable | Interest Rate Swaps                
Derivative                
Derivative, Notional Amount 0.0 0.0 0.0 0.0 $ 0.0 0.0 $ 250.0 250.0
Notional Amount Of Derivatives Additions 0.0 0.0 0.0 0.0        
Notional Amount Of Derivatives Terminations 0.0 $ 250.0 0.0 $ 250.0        
Receive Fixed/Pay Variable | Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument                
Derivative                
Derivative, Notional Amount               $ 250.0
Credit Exposure                
Derivative                
Credit Exposure on Derivatives $ 0.6   $ 0.6     $ 0.7