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Income Taxes (Components of Income Tax Expense (Benefit) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Current:      
Current Federal Tax Expense (Benefit) $ 0.1 $ 0.6 $ 0.2
Current State and Local Tax Expense (Benefit) 1.6 0.1 (1.0)
Current Foreign Tax Expense (Benefit) 0.7 0.8 1.1
Current Income Tax Expense (Benefit) 2.4 1.5 0.3
Deferred:      
Deferred Federal Income Tax Expense (Benefit) 28.7 6.2 (0.6)
Deferred State and Local Income Tax Expense (Benefit) (12.8) 1.3 9.0
Deferred Foreign Income Tax Expense (Benefit) (0.3) (0.2) (0.8)
Deferred Income Tax Expense (Benefit) 15.6 7.3 7.6
Income Tax Expense (Benefit) $ 18.0 $ 8.8 $ 7.9