Allowance for Credit Losses - Summary of Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Allowance for credit losses and recorded investment in financing receivables
January Balance	$ 4.6	$ 4.5
Provision for credit losses	0.0	0.5
March Balance	4.6	5.0
Finance Leases Financing Receivable [Member]
Allowance for credit losses and recorded investment in financing receivables
January Balance	0.5	0.4
Provision for credit losses	0.0	0.5
March Balance	0.5	0.9
Notes Receivable [Member]
Allowance for credit losses and recorded investment in financing receivables
January Balance	4.1	4.1
Provision for credit losses	0.0	0.0
March Balance	$ 4.1	$ 4.1