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Accounts Receivable, Notes Receivable, Allowance for Doubtful Accounts and Bad Debt - Current and Long-Term (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Current:    
Accounts receivable $ 497.7 $ 479.5
Notes receivable 180.4 194.6
Allowance for doubtful accounts (23.3) (17.0)
Current accounts and notes receivable, net 654.8 657.1
Long-term:    
Long-term notes receivable, net 51.3 87.5
Total accounts and notes receivable, net $ 706.1 $ 744.6