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Supplemental Information (Other Noncurrent Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Disclosure Text Block Supplement [Abstract]    
Derivative instruments $ 81.7 $ 85.0
Noncurrent customer receivable 118.0 92.4
Prepaid tax 17.0 13.2
Deferred tax assets 115.2 121.4
Pension benefits 28.7 131.7
Other 243.5 210.8
Other noncurrent assets $ 604.1 $ 654.5