Condensed Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Series A Membership Interest	Series B membership interest
Beginning balance, Predecessor (Predecessor) at Sep. 30, 2015	$ 285.0			$ (162.9)	$ (47.6)	$ 490.4	$ 5.1
Beginning balance, Successor (shares) (Successor) at Sep. 30, 2015		14,853,927
Beginning balance, Successor (Successor) at Sep. 30, 2015	5.0	$ 0.0	$ 6.2	(1.2)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of shares previously subject to redemption (in shares) | Successor		14,168
Reclassification of shares previously subject to redemption | Successor	0.1		0.1
Comprehensive loss:
Net loss | Successor	(0.1)			(0.1)
Ending balance, Successor (shares) (Successor) at Dec. 31, 2015		14,868,095
Ending balance, Successor (Successor) at Dec. 31, 2015	5.0		6.3	(1.3)
Beginning balance, Predecessor (Predecessor) at Sep. 30, 2015	285.0			(162.9)	(47.6)	490.4	5.1
Beginning balance, Successor (shares) (Successor) at Sep. 30, 2015		14,853,927
Beginning balance, Successor (Successor) at Sep. 30, 2015	5.0	$ 0.0	6.2	(1.2)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchases of membership units | Predecessor	(0.1)						(0.1)
Equity-based compensation | Predecessor	2.7						2.7
Comprehensive loss:
Net loss | Predecessor	(13.8)			(13.8)
Other comprehensive loss | Predecessor	(3.7)				(3.7)
Balance at June 8, 2016, Predecessor (Predecessor) at Jun. 08, 2016	$ 270.1			(176.7)	(51.3)	490.4	7.7
Ending balance, Successor (shares) at Jun. 08, 2016	62,531,250
Beginning balance, Predecessor (Predecessor) at Sep. 30, 2015	$ 285.0			(162.9)	(47.6)	490.4	5.1
Beginning balance, Successor (shares) (Successor) at Sep. 30, 2015		14,853,927
Beginning balance, Successor (Successor) at Sep. 30, 2015	5.0	$ 0.0	6.2	(1.2)	0.0
Comprehensive loss:
Net loss | Successor	(17.1)
Other comprehensive loss | Successor	(2.2)
Balance at June 8, 2016, Predecessor (Successor) at Jun. 30, 2016	$ 737.2
Ending balance, Successor (shares) (Successor) at Jun. 30, 2016	89,222,418	89,222,418
Ending balance, Successor (shares) at Jun. 30, 2016	89,222,418
Ending balance, Successor (Successor) at Jun. 30, 2016	$ 737.2	$ 0.0	757.7	(18.3)	(2.2)
Beginning balance, Successor (shares) (Successor) at Dec. 31, 2015		14,868,095
Beginning balance, Successor (Successor) at Dec. 31, 2015	5.0		6.3	(1.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of shares previously subject to redemption (in shares) | Successor		150,231
Reclassification of shares previously subject to redemption | Successor	1.5		1.5
Comprehensive loss:
Net loss | Successor	(1.5)			(1.5)
Ending balance, Successor (shares) (Successor) at Mar. 31, 2016		15,018,326
Ending balance, Successor (Successor) at Mar. 31, 2016	5.0		7.8	(2.8)
Comprehensive loss:
Net loss | Predecessor	(20.2)
Other comprehensive loss | Predecessor	(3.3)
Balance at June 8, 2016, Predecessor (Predecessor) at Jun. 08, 2016	$ 270.1			(176.7)	(51.3)	$ 490.4	$ 7.7
Ending balance, Successor (shares) at Jun. 08, 2016	62,531,250
Beginning balance, Successor (shares) (Successor) at Mar. 31, 2016		15,018,326
Beginning balance, Successor (Successor) at Mar. 31, 2016	$ 5.0		7.8	(2.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation | Successor	0.3		0.3
Reclassification of shares previously subject to redemption (in shares) | Successor		47,512,924
Reclassification of shares previously subject to redemption | Successor	475.2		475.2
Redeemed shares (in shares) | Successor		(29,793,320)
Redeemed shares | Successor	(298.5)		(298.5)
Warrant conversion (in shares) | Successor		2,240,000
Private placement shares issued May 23, 2016 (in shares) | Successor		23,492,306
Private placement shares issued May 23, 2016 | Successor	234.9		234.9
Shares issued to Selling Equityholders (in shares) | Successor		27,673,604
Shares issued to Selling Equityholders | Successor	276.7		276.7
Fair value equity contribution from Sponsor in the form of Founder Shares transferred to Selling Equityholders | Successor	30.2		30.2
Shares issued for advisory services and deferred underwriting fees (in shares) | Successor		3,078,578
Shares issued for advisory services and deferred underwriting fees | Successor	30.8		30.8
Fair value equity contribution from Sponsor in the form of Founder Shares transferred to directors for services rendered | Successor	0.3		0.3
Comprehensive loss:
Net loss | Successor	(15.5)			(15.5)
Other comprehensive loss | Successor	(2.2)				(2.2)
Balance at June 8, 2016, Predecessor (Successor) at Jun. 30, 2016	$ 737.2
Ending balance, Successor (shares) (Successor) at Jun. 30, 2016	89,222,418	89,222,418
Ending balance, Successor (shares) at Jun. 30, 2016	89,222,418
Ending balance, Successor (Successor) at Jun. 30, 2016	$ 737.2	$ 0.0	$ 757.7	$ (18.3)	$ (2.2)