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Income Taxes - Reconciliation to effective income tax rate (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Components Of Deferred Income Tax Assets And Liabilities [Line Items]    
Reported income tax expense $ (126.0) $ 5.6
Effective Income Tax Rate Reconciliation, Percent 263.00% (15.40%)