Accounts and Notes Receivable and Credit Quality of Notes Receivable - Allowance for Doubtful Accounts Receivable (Details) - Notes receivable - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 13.2	$ 5.9
Charge-offs	(0.5)	(0.1)
Recoveries	(0.1)	0.0
Provision	2.0	2.4
Ending balance	14.6	8.2
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment [Roll Forward]
Beginning balance	12.9	5.9
Charge-offs	(0.5)	(0.1)
Recoveries	(0.1)	0.0
Provision	2.0	1.8
Ending balance	14.3	7.6
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	0.0
Provision	0.0	0.6
Ending balance	$ 0.3	$ 0.6