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Other Charges - Accelerated amortization of unamortized deferred financing costs (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]        
Accelerated amortization of unamortized deferred financing costs   $ 1.2 $ 0.0 $ 0.0
Prior credit facility        
Disclosure of detailed information about borrowings [line items]        
Accelerated amortization of unamortized deferred financing costs $ 1.2