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Supplemental Information (Other Income Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
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
[1] Beginning in the second quarter of fiscal year 2017, interest income associated with our short-term investments is reflected on the consolidated income statements in "Other non-operating income (expense), net."
[2] Reflects reimbursement for costs in support of transition services agreements with Versum for EMD and with Evonik for PMD. Refer to Note 4, Materials Technologies Separation, for additional information.