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Accounts Receivable and Notes Receivable and Credit Quality of Notes Receivable - Components of Accounts Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Current:    
Accounts receivable $ 508.1 $ 497.7
Notes receivable 140.0 180.4
Allowance for doubtful accounts (27.7) (23.3)
Current accounts and notes receivable, net 620.4 654.8
Long-term:    
Notes receivable, net of allowance of $0.4 and $0.3 48.1 51.3
Total accounts and notes receivable, net 668.5 706.1
Notes receivable allowance $ 0.4 $ 0.3