Intangible Assets (Acquired Intangible Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015
Intangible Assets (Excluding Goodwill) [Abstract]
Intangible assets, gross	$ 741.9	$ 729.5
Intangible assets, accumulated amortization and impairment	(253.9)	(221.2)
Intangible assets, net	488.0	508.3
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	675.7	666.1
Accumulated amortization	(250.4)	(217.9)
Finite-lived intangible assets, net	425.3	448.2
Trade names and trademarks [Member]
Acquired Indefinite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross	66.2	63.4
Accumulated impairment	(3.5)	(3.3)
Indefinite-lived intangible assets, net	62.7	60.1
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	517.4	507.4
Accumulated amortization	(155.2)	(129.6)
Finite-lived intangible assets, net	362.2	377.8
Patents and Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	76.6	76.9
Accumulated amortization	(57.9)	(53.3)
Finite-lived intangible assets, net	18.7	23.6
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	81.7	81.8
Accumulated amortization	(37.3)	(35.0)
Finite-lived intangible assets, net	$ 44.4	$ 46.8