Certain Balance Sheet Information - Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Jun. 30, 2016	Jun. 08, 2016	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014
Successor
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 38.6		$ 0.2
Successor | China | RMB
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	8.9
Successor | Subsidiaries | Outside of the United States
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	35.4
Successor | Subsidiaries | Outside of the United States | Currencies other than U.S. dollar
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 33.0
Predecessor
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents		$ 64.3	127.7	$ 89.0	$ 88.2
Predecessor | China | RMB
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents			4.7
Predecessor | Subsidiaries | Outside of the United States
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents			54.1
Predecessor | Subsidiaries | Outside of the United States | Currencies other than U.S. dollar
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents			$ 45.0