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Accounting for Derivatives - Interest Rate Risk (Narratives) (Details)
$ in Millions
Mar. 31, 2017
USD ($)
Derivatives  
Deferred pre-tax losses to be reclassified during next 12 months $ 2.5
Derivatives designated as hedging instruments: | Interest rate swaps  
Derivatives  
Weighted average effective fixed interest rate on interest rate swaps (as a percent) 1.60%