Intangible Assets (Acquired Intangible Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, gross	$ 564.5	$ 553.4
Intangible assets, accumulated amortization and impairment	(200.7)	(165.5)
Intangible assets, net	363.8	387.9
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	498.9	487.2
Accumulated amortization	(180.4)	(162.0)
Finite-lived intangible assets, net	318.5	325.2
Trade Names and Trademarks [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross	65.6	66.2
Accumulated impairment	(20.3)	(3.5)
Indefinite-lived intangible assets, net	45.3	62.7
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	412.8	400.6
Accumulated amortization	(134.3)	(118.2)
Finite-lived intangible assets, net	278.5	282.4
Patents and Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	13.6	13.6
Accumulated amortization	(10.5)	(10.1)
Finite-lived intangible assets, net	3.1	3.5
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	72.5	73.0
Accumulated amortization	(35.6)	(33.7)
Finite-lived intangible assets, net	$ 36.9	$ 39.3