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Income Taxes (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2013
Change in weighted average enacted income tax rate     0.52%    
Income Tax Expense (Benefit) $ 10.8 $ 4.2 $ 14.2 $ 5.1  
Valuation allowance, change       7.1  
Unrecognized Tax Benefits 2.7   2.7   3.7
Accrued interest related to uncertain tax positions 0.8   0.8   0.9
Income Tax Examination, Penalties and Interest Expense         0
Valuation Allowance of Deferred Tax Assets [Member]
          
Valuation allowance, change       15.1  
Effect of Change in Marginal Tax Rate [Member]
          
Income Tax Expense (Benefit) 0 0 (2.0) 0  
Valuation Allowance of Deferred Tax Assets [Member]
          
Income Tax Expense (Benefit) 1.1 (4.0) (1.1) (4.5)  
Discontinued Operation, Tax Effect of Discontinued Operation       $ 3.5