Goodwill and Other Intangibles - Ending balance of intangible assets (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cost	$ 594.0	$ 613.7
Accumulated Amortization	513.1	483.1
Net	80.9	130.6
Patents [Member]
Cost	355.8	376.1
Accumulated Amortization	334.5	334.1
Net	21.3	42.0
Developed Technology [Member]
Cost	131.0	129.1
Accumulated Amortization	94.7	79.9
Net	36.3	49.2
Contracts [Member]
Cost	20.1	20.1
Accumulated Amortization	19.3	18.6
Net	0.8	1.5
Reacquired Rights [Member]
Cost	13.4	14.7
Accumulated Amortization	5.1	5.2
Net	8.3	9.5
Customer Relationship [Member]
Cost	61.2	61.2
Accumulated Amortization	52.0	40.1
Net	9.2	21.1
Trademark [Member]
Cost	12.5	12.5
Accumulated Amortization	7.5	5.2
Net	$ 5.0	$ 7.3