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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   $ (42.5) $ (0.4) $ 0.4
Transition Tax Expense $ 7.5      
Effective Income Tax Rate Reconciliation, Federal Transition Tax, Amount   7.5 0.0 0.0
Unrecognized Tax Benefits, Interest on Income Taxes Accrued   0.6 0.7  
Income tax expense (benefit)   (9.9) $ 24.2 $ 24.2
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit   0.8    
Deferred Tax Assets, Tax Credit Carryforwards, Foreign   $ 4.5