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Derivative Financial Instruments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Derivative                
Derivative, Notional Amount $ 930.8 $ 795.9 $ 930.8 $ 795.9 $ 819.7 $ 799.2 $ 808.0 $ 904.5
Notional Amount Of Derivatives Additions 380.9 43.1 504.0 116.9        
Notional Amount Of Derivatives Terminations 269.5 55.2 371.6 225.5        
Aggregate Fair Value of all Derivative Instruments with Credit Risk-related Contingent Features in a Liability Position 33.9   33.9     38.0    
Approximate Amount of Net Deferred Gains on Derivative Instruments Expected to be Amortized During the Next Twelve Months     $ 73.2          
Maximum Length of Time Hedged in Cash Flow Hedge     26 years          
Component of Derivative Gain (Loss) Excluded from the Assessment of Hedge Effectiveness (0.6) 1.2 $ 0.9 0.2        
Discontinued Hedge Accounting Due to Instrument No Longer Qualifying as Fair Value Hedge 0.0 0.0 0.0 0.0        
Forwards                
Derivative                
Derivative, Notional Amount 102.9 0.0 102.9 0.0 0.0 0.0 20.6 0.0
Notional Amount Of Derivatives Additions 358.9 0.0 382.4 47.4        
Notional Amount Of Derivatives Terminations 256.0 20.6 279.1 47.4        
Forwards | Not Designated as Hedging Instrument                
Derivative                
Derivative, Notional Amount 8.9   8.9          
Forwards | Cash Flow Hedging | Designated as Hedging Instrument                
Derivative                
Derivative, Notional Amount 94.0   94.0          
Notional Amount Of Derivatives Additions     350.0          
Notional Amount Of Derivatives Terminations     256.0          
Derivative, Loss on Derivative     0.6          
Derivative, Cost of Hedge     3.8          
Credit Risk Contract | Credit Default Swaps                
Derivative                
Derivative, Notional Amount 10.6 11.2 10.6 11.2 10.9 11.0 0.0 70.0
Notional Amount Of Derivatives Additions 0.0 11.2 0.0 11.2        
Notional Amount Of Derivatives Terminations 0.0 0.0 0.0 70.0        
Credit Risk Contract | Credit Default Swaps | Not Designated as Hedging Instrument                
Derivative                
Derivative, Notional Amount 10.6   10.6     11.0    
Credit Exposure                
Derivative                
Current Credit Exposure on Derivatives 0.3   0.3     0.9    
Receive Fixed/Pay Fixed | Interest Rate Swaps                
Derivative                
Derivative, Notional Amount 567.3 534.7 567.3 534.7 558.8 538.2 537.4 536.5
Notional Amount Of Derivatives Additions 22.0 31.9 121.6 58.3        
Notional Amount Of Derivatives Terminations 13.5 34.6 92.5 60.1        
Receive Fixed/Pay Fixed | Interest Rate Swaps | Not Designated as Hedging Instrument                
Derivative                
Derivative, Notional Amount 148.2   148.2     173.7    
Receive Fixed/Pay Fixed | Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument                
Derivative                
Derivative, Notional Amount 219.4   219.4     286.4    
Receive Fixed/Pay Fixed | Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument                
Derivative                
Derivative, Notional Amount 199.7   199.7     78.1    
Receive Variable/Pay Fixed | Interest Rate Swaps                
Derivative                
Derivative, Notional Amount 0.0 0.0 0.0 0.0 0.0 0.0 0.0 48.0
Notional Amount Of Derivatives Additions 0.0 0.0 0.0 0.0        
Notional Amount Of Derivatives Terminations 0.0 0.0 0.0 48.0        
Receive Fixed/Pay Variable | Interest Rate Swaps                
Derivative                
Derivative, Notional Amount 250.0 250.0 250.0 250.0 $ 250.0 250.0 $ 250.0 $ 250.0
Notional Amount Of Derivatives Additions 0.0 0.0 0.0 0.0        
Notional Amount Of Derivatives Terminations 0.0 $ 0.0 0.0 $ 0.0        
Receive Fixed/Pay Variable | Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument                
Derivative                
Derivative, Notional Amount $ 250.0   $ 250.0     $ 250.0