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Accumulated Other Comprehensive Income - Components of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Successor    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign Currency Translation Adjustment $ (0.8)  
Successor | Foreign Currency Translation Adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax, beginning of period 1.4  
Foreign Currency Translation Adjustment (0.8)  
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax, end of period 0.6  
Successor | Total Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign Currency Translation Adjustment (0.8)  
Accumulated other comprehensive income, beginning of period 1.4  
Accumulated other comprehensive income (loss), current period change, net of tax (0.8)  
Accumulated other comprehensive income, end of period $ 0.6  
Predecessor    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign Currency Translation Adjustment   $ 5.5