Discontinued Operations and Restructuring - Changes in Accrued Amounts (Details) - Discontinued Operations [Member] - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Disposal Group, Including Discontinued Operation, Accrued Liabilities [Roll Forward]
Beginning balance	$ 8.9	$ 7.1	$ 0.0
Charged to expense	10.6	9.1	8.7
Cash payments	(12.3)	(4.0)	(1.6)
Other	(0.8)	(3.3)	0.0
Ending balance	$ 6.4	$ 8.9	$ 7.1