Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Successor [Member]
Allowance for doubtful accounts	$ 0.0
Common stock, par value (in dollars per share)	$ 0.01
Common stock, shares authorized	300,000,000
Common stock, shares issued	25,002,000
Predecessor [Member]
Allowance for doubtful accounts		$ 7.8
Common stock, par value (in dollars per share)		$ 0.01
Common stock, shares authorized		26,000,000
Common stock, shares issued		21,446,000