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Supplemental Information (Other Noncurrent Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Supplemental Information [Abstract]    
Derivative instruments $ 85.0 $ 133.9
Noncurrent customer receivable 92.4 62.6
Prepaid tax 13.2 5.1
Deferred tax assets 121.4 174.5
Pension benefits 131.7 18.4
Deposits 0.0 34.8
Other 210.8 212.5
Other noncurrent assets $ 654.5 $ 641.8