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Income Taxes Income tax (tables) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Tax Expense (Benefit) $ 10.8 $ 4.2 $ 14.2 $ 5.1
Operating Expense [Member]
        
Income Tax Expense (Benefit) 11.9 8.1 17.5 9.6
Valuation Allowance of Deferred Tax Assets [Member]
        
Income Tax Expense (Benefit) 1.1 (4.0) (1.1) (4.5)
Effect of Change in Marginal Tax Rate [Member]
        
Income Tax Expense (Benefit) 0 0 (2.0) 0
Other Expense [Member]
        
Income Tax Expense (Benefit) $ 0 $ 0.1 $ (0.2) $ 0