Goodwill and Intangible Assets (Acquired Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Intangible Assets (Excluding Goodwill) [Abstract]
Intangible assets, gross	$ 975.1	$ 445.4
Intangible assets, net	761.6	260.5
Acquired Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	(213.5)	(184.9)
Finite-lived intangible assets, net	663.9
Trade names and trademarks [Member]
Acquired Indefinite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	97.7
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period	21 years 11 months
Finite-lived intangible assets, gross	665.3	270.0
Accumulated amortization	(93.1)	(73.1)
Finite-lived intangible assets, net	572.2	196.9
Patented Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period	17 years 0 months
Finite-lived intangible assets, gross	129.8	97.1
Accumulated amortization	(82.0)	(75.9)
Finite-lived intangible assets, net	47.8	21.2
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period	29 years 6 months
Finite-lived intangible assets, gross	82.3	78.3
Accumulated amortization	(38.4)	(35.9)
Finite-lived intangible assets, net	$ 43.9	$ 42.4