Goodwill and Other Intangibles - Goodwill (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Goodwill by geographical region [Roll Forward]
Goodwill, Beginning Balance	$ 1,471.1	$ 1,469.7
Acquisitions (See Note 21)	0.5
Purchase price adjustments		(0.2)
Foreign currency	(10.0)	1.6
Ending balance	1,461.6	1,471.1
North America [Member]
Goodwill by geographical region [Roll Forward]
Goodwill, Beginning Balance	1,275.4	1,275.6
Acquisitions (See Note 21)	0.5
Purchase price adjustments		(0.2)
Foreign currency	0	0
Ending balance	1,275.9	1,275.4
International [Member]
Goodwill by geographical region [Roll Forward]
Goodwill, Beginning Balance	195.7	194.1
Acquisitions (See Note 21)	0
Purchase price adjustments		0
Foreign currency	(10.0)	1.6
Ending balance	$ 185.7	$ 195.7