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Accounting Policies - Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Tax cuts and jobs act of 2017, provisional income tax benefit $ 10.0  
Tax cuts and jobs act of 2017, provisional benefit, change in tax rate 16.0  
Tax cuts and jobs act of 2017, provisional income tax expense, transition tax for accumulated foreign earnings 7.0  
Accumulated foreign earnings 101.0  
Tax cuts and jobs act of 2017, provision income tax benefit, current year cash dividends 1.0  
Current and prior year undistributed earnings of subsidiaries operating outside the U.S 151.0  
Investment in Joint Venture $ 5.3 $ 0.0