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Derivative Instruments and Hedging Activities - Fair Value by Balance Sheet Location (Details) - Interest Rate Swaps - Designated as Hedging Instrument - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Other Assets    
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 0.4 $ 0.0
Other Liabilities    
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ 1.6 $ 0.0