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Accumulated Other Comprehensive Income - Components of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 01, 2017
Jun. 30, 2018
Jun. 30, 2017
Apr. 01, 2017
Jun. 30, 2018
Successor          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Foreign Currency Translation Adjustment   $ (2.2) $ 0.5   $ (3.0)
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         (3.0)
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax, end of period   (1.6)     (1.6)
Successor | Total Accumulated Other Comprehensive Income (Loss)          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Foreign Currency Translation Adjustment         (3.0)
Accumulated other comprehensive income, beginning of period         1.4
Accumulated other comprehensive income (loss), current period change, net of tax         (3.0)
Accumulated other comprehensive income, end of period   $ (1.6)     $ (1.6)
Predecessor          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Foreign Currency Translation Adjustment $ 0.0     $ 5.5