Accounts and Notes Receivable and Credit Quality of Notes Receivable - Components Accounts and Notes Receivable, Net (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Current:
Accounts receivable	$ 483.2	$ 497.7
Notes receivable	176.3	180.4
Allowance for doubtful accounts	(25.6)	(23.3)
Current accounts and notes receivable, net	633.9	654.8
Long-term:
Notes receivable, net	45.8	51.3
Total accounts and notes receivable, net	$ 679.7	$ 706.1