Goodwill and Other Intangibles (Details) - Ending balance of intangible assets (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Cost	$ 613.7	$ 623.7
Accumulated Amortization	483.1	430.3
Net	130.6	193.4
Aggregate amortization	63.1	62.9	49.1
Estimated future amortization [Abstract]
2014	52.0
2015	36.1
2016	22.0
2017	10.2
2018	5.2
Patents [Member]
Cost	376.1	379.6
Accumulated Amortization	334.1	310.7
Net	42.0	68.9
Developed Technology [Member]
Cost	129.1	131.9
Accumulated Amortization	79.9	68.3
Net	49.2	63.6
Contracts [Member]
Cost	20.1	23.9
Accumulated Amortization	18.6	21.1
Net	1.5	2.8
Reacquired Rights [Member]
Cost	14.7	14.7
Accumulated Amortization	5.2	3.5
Net	9.5	11.2
Customer Relationship [Member]
Cost	61.2	61.1
Accumulated Amortization	40.1	23.9
Net	21.1	37.2
Trademark [Member]
Cost	12.5	12.5
Accumulated Amortization	5.2	2.8
Net	$ 7.3	$ 9.7