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Supplemental Cash Flow Information (Schedule of Cash Flow, Supplemental Disclosures) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Schedule of Cash Flow, Supplemental Disclosures [Line Items]      
Increase (decrease) in other noncurrent assets $ 1.3 $ 0.0 $ (0.3)
Decrease (increase) in other noncurrent liabilities 28.3 (25.5) 51.5
Increase in other current liabilities 0.0 0.1 0.0
Decrease (increase) in deferred tax liabilities 10.6 (9.8) 20.1
Decrease (increase) in accumulated other comprehensive loss 16.4 (15.6) 31.7
Increase (Decrease) in Other Operating Assets and Liabilities, Net 0.0 0.0 0.0
Cash paid, net:      
Interest 36.8 48.7 49.1
Income taxes $ 13.3 $ 2.6 $ 0.7