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Lease Obligations (Schedule of Capital Leased Assets) (Details) - Machinery and Equipment - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Capital Leased Assets [Line Items]    
Leased equipment—gross $ 33.4 $ 38.0
Less: accumulated depreciation (18.9) (19.3)
Leased equipment—net $ 14.5 $ 18.7