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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Derivative collateral $ 200.0 $ 1,600.0
Credit risk, maximum exposure $ 16.1 $ 11.9
Interest Rate Caps    
Derivative [Line Items]    
Derivative, term of contract 7 years  
Interest Rate Swap    
Derivative [Line Items]    
Derivative, term of contract 7 years  
Three Month London Interbank Offered Rate (LIBOR) | Interest Rate Caps    
Derivative [Line Items]    
Cap rate 2.50%