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Income Taxes - Income tax (benefit) provision (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Current      
Federal $ 59.5 $ 0.9 $ 33.0
State 2.9 0.0 3.2
Foreign 5.7 2.9 0.0
Current 68.1 3.8 36.2
Deferred      
Federal (116.0) (80.1) (26.8)
State (2.1) (7.3) (1.8)
Foreign (2.0) (0.1) (0.5)
Deferred (120.1) (87.5) (29.1)
Income tax (benefit) provision $ (52.0) $ (83.7) $ 7.1