Goodwill and Other Intangible Assets (Details 1) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2012	Sep. 30, 2011
Other intangible assets
Amortized intangible assets, carrying amount	$ 327.4	$ 311.5
Amortized intangible assets, accumulated amortization	155.2	137.2
Amortized intangible assets, net	172.2	174.3
Intangible assets not subject to amortization	43.7	43.7
Total other intangible assets, carrying amount	371.1	355.2
Total other intangible assets, net	215.9	218.0
Goodwill and Other Intangible Assets (Textual) [Abstract]
Estimated amortization expense in 2012	36.0
Estimated amortization expense in 2013	32.3
Estimated amortization expense in 2014	27.0
Estimated amortization expense in 2015	21.4
Estimated amortization expense in 2016	16.8
Computer software products [Member]
Other intangible assets
Amortized intangible assets, carrying amount	112.2	101.2
Amortized intangible assets, accumulated amortization	53.4	45.3
Amortized intangible assets, net	58.8	55.9
Customer relationships [Member]
Other intangible assets
Amortized intangible assets, carrying amount	73.2	72.4
Amortized intangible assets, accumulated amortization	27.1	23.2
Amortized intangible assets, net	46.1	49.2
Technology [Member]
Other intangible assets
Amortized intangible assets, carrying amount	88.7	85.1
Amortized intangible assets, accumulated amortization	47.4	44.0
Amortized intangible assets, net	41.3	41.1
Trademarks [Member]
Other intangible assets
Amortized intangible assets, carrying amount	31.7	31.2
Amortized intangible assets, accumulated amortization	11.0	9.0
Amortized intangible assets, net	20.7	22.2
Other [Member]
Other intangible assets
Amortized intangible assets, carrying amount	21.6	21.6
Amortized intangible assets, accumulated amortization	16.3	15.7
Amortized intangible assets, net	$ 5.3	$ 5.9