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Lease Arrangements (Schedule of Capital Leased Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Capital Leased Assets [Line Items]    
Machinery and equipment $ 24.1 $ 20.4
Machinery and Equipment    
Capital Leased Assets [Line Items]    
Machinery and equipment 24.1 20.4
Less accumulated depreciation (4.7) (2.3)
Capital lease assets, net $ 19.4 $ 18.1