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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative        
Aggregate fair value of all derivative instruments with credit risk-related contingent features in a liability position $ 34.6 $ 38.0    
Additions 553.7 136.5 $ 92.1  
Approximate amount of net deferred gains on derivative instruments expected to be amortized during the next twelve months 76.2      
Notional Amount Of Derivatives Terminations 471.5 241.8 239.6  
Component of Derivative Gain (Loss) Excluded from the Assessment of Hedge Effectiveness 2.0 2.5    
Discontinued Hedge Accounting Due to Instrument No Longer Qualifying as Fair Value Hedge 0.0 0.0    
Derivative, Notional Amount 881.4 799.2 904.5 $ 1,052.0
Credit Risk Contract | Credit Default Swaps        
Derivative        
Additions 0.0 11.0 0.0  
Notional Amount Of Derivatives Terminations 0.0 70.0 0.0  
Derivative, Notional Amount 11.4 11.0 70.0 70.0
Credit Risk Contract | Credit Default Swaps | Not Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount 11.4 11.0    
Forwards        
Derivative        
Additions 382.4 47.4 65.7  
Notional Amount Of Derivatives Terminations 373.1 47.4 75.7  
Derivative, Notional Amount 8.9 0.0 0.0 10.0
Forwards | Not Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount 8.9      
Forwards | Cash Flow Hedging | Designated as Hedging Instrument        
Derivative        
Additions 350.0      
Derivative, Loss on Derivative 0.5      
Derivative, Cost of Hedge 5.3      
Credit Exposure        
Derivative        
Credit Exposure on Derivatives 0.0 0.9    
Receive Fixed/Pay Fixed | Interest Rate Swaps        
Derivative        
Additions 171.3 78.1 26.4  
Notional Amount Of Derivatives Terminations 98.4 76.4 106.4  
Derivative, Notional Amount 611.1 538.2 536.5 616.5
Receive Fixed/Pay Fixed | Interest Rate Swaps | Not Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount 148.2 173.7    
Receive Fixed/Pay Fixed | Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount 213.5 286.4    
Receive Fixed/Pay Fixed | Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount 249.4 78.1    
Receive Variable/Pay Fixed | Interest Rate Swaps        
Derivative        
Additions 0.0 0.0 0.0  
Notional Amount Of Derivatives Terminations 0.0 48.0 57.5  
Loss on Contract Termination     0.1  
Derivative, Notional Amount 0.0 0.0 48.0 105.5
Receive Variable/Pay Fixed | Interest Rate Swaps | Not Designated as Hedging Instrument        
Derivative        
Loss on Contract Termination     0.1  
Derivative, Notional Amount       3.5
Receive Fixed/Pay Variable | Interest Rate Swaps        
Derivative        
Additions 0.0 0.0 0.0  
Notional Amount Of Derivatives Terminations 0.0 0.0 0.0  
Derivative, Notional Amount 250.0 250.0 $ 250.0 $ 250.0
Receive Fixed/Pay Variable | Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount $ 250.0 $ 250.0