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Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Unrealized loss on derivatives arising during period, before tax $ 1.1 $ 1.3
Other comprehensive income (loss), tax $ 0.1 $ 0.1