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Accounts and Notes Receivable and Credit Quality of Receivables - Components of Accounts and Notes Receivable, Net (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Current:    
Accounts receivable $ 502.4 $ 508.1
Notes receivable 136.5 140.0
Allowance for doubtful accounts and notes (27.9) (27.7)
Current accounts and notes receivable, net 611.0 620.4
Long-term:    
Notes receivable, net of allowance of $0.4 and $0.4 44.4 48.1
Total accounts and notes receivable, net 655.4 668.5
Allowance for notes receivable $ 0.4 $ 0.4