Intangible Assets (Acquired Intangible Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Intangible Assets (Excluding Goodwill) [Abstract]
Intangible assets, gross	$ 729.5	$ 824.2
Intangible assets, accumulated amortization and impairment	(221.2)	(208.4)
Intangible assets, net	508.3	615.8
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	666.1	744.9
Accumulated amortization	(217.9)	(203.7)
Finite-lived intangible assets, net	448.2	541.2
Trade names and trademarks [Member]
Acquired Indefinite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross	63.4	79.3
Accumulated impairment	(3.3)	(4.7)
Indefinite-lived intangible assets, net	60.1	74.6
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	507.4	577.8
Accumulated amortization	(129.6)	(119.0)
Finite-lived intangible assets, net	377.8	458.8
Patents and Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	76.9	82.4
Accumulated amortization	(53.3)	(52.2)
Finite-lived intangible assets, net	23.6	30.2
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	81.8	84.7
Accumulated amortization	(35.0)	(32.5)
Finite-lived intangible assets, net	$ 46.8	$ 52.2