Accounts and Notes Receivable and Credit Quality of Notes Receivable - Components Accounts and Notes Receivable, Net (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Current:
Accounts receivable	$ 514.0	$ 497.7
Notes receivable	154.5	180.4
Allowance for doubtful accounts	(27.2)	(23.3)
Current accounts and notes receivable, net	641.3	654.8
Long-term:
Notes receivable, net	43.8	51.3
Total accounts and notes receivable, net	$ 685.1	$ 706.1