Goodwill and Other Intangibles - Amortization Expense (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Jun. 08, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 08, 2016	Jun. 30, 2016	Jun. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Expected amortization expense, 2017		$ 21.5			$ 21.5
Expected amortization expense, 2018		21.5			21.5
Expected amortization expense, 2019		21.5			21.5
Expected amortization expense, 2020		19.9			19.9
Expected amortization expense, 2021		16.4			16.4
Successor
Finite-Lived Intangible Assets [Line Items]
Amortization expense		$ 1.3			$ 1.3
Predecessor
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 2.8		$ 3.9	$ 10.6		$ 11.8