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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative        
Aggregate fair value of all derivative instruments with credit risk-related contingent features in a liability position $ 35.0 $ 59.7    
Approximate amount of net deferred gains on derivative instruments expected to be amortized during the next twelve months 50.3      
Notional Amount Of Derivatives Terminations 1,314.3 257.3 $ 471.5  
Component of Derivative Gain (Loss) Excluded from the Assessment of Hedge Effectiveness 16.6 (1.8) 2.0  
Discontinued Hedge Accounting Due to Instrument No Longer Qualifying as Fair Value Hedge 0.0 0.0    
Additions 1,540.5 120.0 553.7  
Derivative, Notional Amount 970.5 744.4 881.4 $ 799.2
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 0.6 30.7    
Credit Risk Contract | Credit Default Swaps        
Derivative        
Notional Amount Of Derivatives Terminations 0.0 0.0 0.0  
Additions 0.0 0.0 0.0  
Derivative, Notional Amount 11.6 11.7 11.4 11.0
Credit Risk Contract | Credit Default Swaps | Not Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount 11.6 11.7    
Forwards        
Derivative        
Notional Amount Of Derivatives Terminations 310.7 3.4 373.1  
Additions 340.5 6.4 382.4  
Derivative, Notional Amount 41.7 11.9 8.9 0.0
Forwards | Not Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount 41.7 11.9    
Forwards | Cash Flow Hedging | Designated as Hedging Instrument        
Derivative        
Derivative, Loss on Derivative 1.2 0.5    
Derivative, Cost of Hedge   5.3    
Notional Amount Of Derivatives Terminations 250.0      
Additions 250.0 350.0    
Total Return Swap | Not Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount 89.2      
Receive Fixed/Pay Fixed | Interest Rate Swaps        
Derivative        
Notional Amount Of Derivatives Terminations 29.3 3.9 98.4  
Additions 136.5 113.6 171.3  
Derivative, Notional Amount 828.0 720.8 611.1 538.2
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 181.3 210.2    
Receive Fixed/Pay Fixed | Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount 498.5 362.4    
Receive Fixed/Pay Variable | Interest Rate Swaps        
Derivative        
Notional Amount Of Derivatives Terminations 0.0 250.0 0.0  
Additions 0.0 0.0 0.0  
Derivative, Notional Amount 0.0 0.0 $ 250.0 $ 250.0
Receive Fixed/Pay Variable | Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument        
Derivative        
Derivative, Notional Amount   250.0    
Credit Exposure        
Derivative        
Credit Exposure on Derivatives $ 1.3 $ 0.7