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Accounts and Notes Receivable and Credit Quality of Receivables - Components of Accounts and Notes Receivable, Net (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Current:    
Accounts receivable $ 575.4 $ 551.5
Notes receivable 146.2 164.1
Allowance for doubtful accounts and notes (35.8) (31.2)
Current accounts and notes receivable, net 685.8 684.4
Long-term:    
Notes receivable, net of allowance of $0.1 and $0.2 48.0 52.8
Total accounts and notes receivable, net 733.8 737.2
Allowance for notes receivable $ 0.1 $ 0.2