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Accounts and Notes Receivable (Schedule of Accounts and Notes Receivable) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Customer receivables $ 75.5 $ 62.8
Miscellaneous receivables 8.4 29.9
Less allowance for warranties, discounts and losses (2.5) (1.9)
Accounts and notes receivable, net $ 81.4 $ 90.8