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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative        
Aggregate fair value of all derivative instruments with credit risk-related contingent features in a liability position $ 59.7 $ 34.6    
Additions 120.0 553.7 $ 136.5  
Approximate amount of net deferred gains on derivative instruments expected to be amortized during the next twelve months 60.3      
Notional Amount Of Derivatives Terminations 257.3 471.5 241.8  
Component of Derivative Gain (Loss) Excluded from the Assessment of Hedge Effectiveness (1.8) 2.0 2.5  
Discontinued Hedge Accounting Due to Instrument No Longer Qualifying as Fair Value Hedge 0.0 0.0    
Derivative, Notional Amount 744.4 881.4 799.2 $ 904.5
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 30.7      
Credit Risk Contract | Credit Default Swaps        
Derivative        
Additions 0.0 0.0 11.0  
Notional Amount Of Derivatives Terminations 0.0 0.0 70.0  
Derivative, Notional Amount 11.7 11.4 11.0 70.0
Credit Risk Contract | Credit Default Swaps | Not Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount 11.7 11.4    
Forwards        
Derivative        
Additions 6.4 382.4 47.4  
Notional Amount Of Derivatives Terminations 3.4 373.1 47.4  
Derivative, Notional Amount 11.9 8.9 0.0 0.0
Forwards | Not Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount 11.9 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 0.7 0.0    
Receive Fixed/Pay Fixed | Interest Rate Swaps        
Derivative        
Additions 113.6 171.3 78.1  
Notional Amount Of Derivatives Terminations 3.9 98.4 76.4  
Derivative, Notional Amount 720.8 611.1 538.2 536.5
Receive Fixed/Pay Fixed | Interest Rate Swaps | Not Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount 148.2 148.2    
Receive Fixed/Pay Fixed | Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount 210.2 213.5    
Receive Fixed/Pay Fixed | Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount 362.4 249.4    
Receive Variable/Pay Fixed | Interest Rate Swaps        
Derivative        
Additions 0.0 0.0 0.0  
Notional Amount Of Derivatives Terminations 0.0 0.0 48.0  
Derivative, Notional Amount 0.0 0.0 0.0 48.0
Receive Fixed/Pay Variable | Interest Rate Swaps        
Derivative        
Additions 0.0 0.0 0.0  
Notional Amount Of Derivatives Terminations 250.0 0.0 0.0  
Derivative, Notional Amount $ 0.0 250.0 $ 250.0 $ 250.0
Receive Fixed/Pay Variable | Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount   $ 250.0