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Accounts and Notes Receivable and Credit Quality of Notes Receivable (Components of Current and Long-term Accounts and Notes Receivable, Net) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Current:    
Accounts receivable $ 493.9 $ 479.5
Notes receivable 179.5 194.6
Allowance for doubtful accounts (18.4) (17.0)
Current accounts and notes receivable, net 655.0 657.1
Long-term:    
Notes receivable 58.5 87.5
Total accounts and notes receivable, net $ 713.5 $ 744.6