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Discontinued Operations and Restructuring - Change in Accrued Amounts (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Disposal Group, Including Discontinued Operation, Accrued Liabilities [Roll Forward]        
Beginning balance $ 10.2 $ 2.2 $ 8.9 $ 7.1
Charged to expense 0.0 0.0 4.0 0.0
Cash payments (0.1) (0.5) (1.5) (3.4)
Other 0.0 (0.8) (1.3) (2.8)
Ending balance $ 10.1 $ 0.9 10.1 $ 0.9
One-time charges related to regulatory compliance     3.3  
One-time charges related to severance costs     $ 0.7