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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Derivative          
Aggregate fair value of all derivative instruments with credit risk-related contingent features in a liability position $ 56.4   $ 56.4   $ 35.0
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     39.2    
Component of Derivative Gain (Loss) Excluded from the Assessment of Hedge Effectiveness 0.2 $ 0.4 13.9 10.6  
Discontinued Hedge Accounting Due to Instrument No Longer Qualifying as Fair Value Hedge 0.0 $ 0.0 0.0 0.0  
Derivative, Notional Amount 1,672.9   1,672.9   970.5
Derivative Asset, Fair Value, Gross Asset 128.1   128.1   39.5
Designated as Hedging Instrument          
Derivative          
Derivative, Notional Amount 1,400.2   1,400.2   679.8
Not Designated as Hedging Instrument          
Derivative          
Derivative, Notional Amount 272.7   272.7   290.7
Cash Flow Hedging | Designated as Hedging Instrument          
Derivative          
Derivative, Notional Amount 842.0   842.0    
Interest Rate Swaps | Not Designated as Hedging Instrument          
Derivative          
Derivative, Notional Amount 148.2   148.2   148.2
Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument          
Derivative          
Derivative, Notional Amount 178.0   178.0   181.3
Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument          
Derivative          
Derivative, Notional Amount 558.2   558.2   498.5
Credit Default Swap | Credit Default Swaps | Not Designated as Hedging Instrument          
Derivative          
Derivative, Notional Amount 0.0   0.0   11.6
Forwards | Not Designated as Hedging Instrument          
Derivative          
Derivative, Notional Amount 54.3   54.3   41.7
Forwards | Cash Flow Hedging | Designated as Hedging Instrument          
Derivative          
Derivative, Notional Amount 664.0   664.0    
Notional Amount Of Derivatives Additions 500.0   679.0 250.0  
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 70.2   70.2   89.2
Embedded Derivative in Modified Coinsurance Arrangement | Not Designated as Hedging Instrument          
Derivative          
Derivative, Notional Amount 0.0   0.0   0.0
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 178.0   178.0   181.3
Receive Fixed/Pay Fixed | Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument          
Derivative          
Derivative, Notional Amount 558.2   558.2   498.5
Credit Exposure          
Derivative          
Credit Exposure on Derivatives $ 1.7   $ 1.7   $ 1.3