Lease Commitments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2015	Oct. 08, 2015	Dec. 31, 2017	Dec. 31, 2016
Operating Leased Assets [Line Items]
Rent expense	$ 3.2		$ 37.9	$ 23.6
Predecessor
Operating Leased Assets [Line Items]
Rent expense		$ 9.6
Minimum
Operating Leased Assets [Line Items]
Renewal options			5 years
Maximum
Operating Leased Assets [Line Items]
Renewal options			10 years
Leasehold Improvements
Operating Leased Assets [Line Items]
Useful life			10 years