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Discontinued Operations (Schedule of Assets and Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Plant and equipment $ 18.7 $ 0.0
Other current assets 0.1 1.8
Total Current Assets 18.8 1.8
Plant and equipment 0.0 891.8
Total Noncurrent Assets 0.0 891.8
Payables and accrued liabilities 18.6 17.0
Other current liabilities 2.8 0.0
Total Current Liabilities 21.4 17.0
Other noncurrent liabilities 0.0 2.5
Total Noncurrent Liabilities $ 0.0 $ 2.5