Accounts and Notes Receivable and Credit Quality of Notes Receivable - Allowance for Doubtful Accounts Receivable (Details) - Notes receivable - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 13.2	$ 5.9
Charge-offs	(1.3)	(2.1)
Recoveries	(0.2)	(0.5)
Provision	3.1	6.4
Ending balance	14.8	9.7
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment [Roll Forward]
Beginning balance	12.9	5.9
Charge-offs	(1.3)	(2.1)
Recoveries	(0.2)	(0.4)
Provision	3.1	5.2
Ending balance	14.5	8.6
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment [Roll Forward]
Beginning balance	0.3	0.0
Charge-offs	0.0	0.0
Recoveries	0.0	(0.1)
Provision	0.0	1.2
Ending balance	$ 0.3	$ 1.1