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Supplemental Cash Flow Information (Schedule of Cash Flow, Supplemental Disclosures) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Cash paid, net:      
Interest $ 21.1 $ 36.8 $ 48.7
Income taxes $ 36.9 $ 13.3 $ 2.6