Supplemental Information (Other Income Expense) (Details) - USD ($) $ in Millions |
12 Months Ended | |||||||
---|---|---|---|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2015 |
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Supplemental Information [Abstract] | ||||||||
Technology and royalty income | $ 20.8 | $ 19.0 | $ 22.8 | |||||
Interest income | [1] | 1.5 | 6.1 | 4.2 | ||||
Foreign exchange | 4.3 | (7.2) | (22.6) | |||||
Sale of assets and investments | 24.3 | 8.8 | 36.3 | |||||
Contract settlements | 14.3 | 12.6 | 0.0 | |||||
Transition service agreements reimbursement | [2] | 38.4 | 0.0 | 0.0 | ||||
Other | 17.4 | 10.1 | 4.8 | |||||
Other income (expense), net | $ 121.0 | $ 49.4 | $ 45.5 | |||||
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