Condensed Consolidated Statements of Equity - 3 months ended Dec. 31, 2016 - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Beginning balance, Successor (shares) (Successor) at Sep. 30, 2016		89,286,936
Beginning balance, Successor (shares) at Sep. 30, 2016	89,286,936
Beginning balance, Successor (Successor) at Sep. 30, 2016	$ 744.8	$ 0.0	$ 758.9	$ (9.6)	$ (4.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation | Successor	1.4		1.4
Comprehensive loss:
Net loss | Successor	(8.3)			(8.3)
Other comprehensive loss | Successor	$ (12.7)				(12.7)
Ending balance, Successor (shares) (Successor) at Dec. 31, 2016		89,286,936
Ending balance, Successor (shares) at Dec. 31, 2016	89,286,936
Ending balance, Successor (Successor) at Dec. 31, 2016	$ 725.2	$ 0.0	$ 760.3	$ (17.9)	$ (17.2)