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Income Taxes (Reconciliation of Statutory Taxes to Effective Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]      
Tax at U.S. federal statutory income tax rate of 35% $ 34.0 $ 17.7 $ 25.7
Adjustments to reconcile to income tax expense (benefit):      
Federal Valuation Allowance (0.2) 0.6 (1.2)
State income taxes, net of federal benefit 3.8 2.4 3.6
Domestic production activities deduction (3.9) (1.5) 0.0
State tax rate change 0.4 0.0 (2.5)
Effective Income Tax Rate Reconciliation, Change in State Deferred TAx Assets Valuation Allowance, Amount. 0.0 (0.1) (8.4)
Tax Credits (2.2) (1.3) (0.1)
Other nondeductible expenses 0.9 0.7 0.9
Foreign income taxes 0.1 0.4 (0.2)
Nondeductible compensation 0.4 0.3 0.8
Other income tax (0.2) 0.6 (0.6)
Income tax expense (benefit) $ 33.1 $ 19.8 $ 18.0