Allowance for Credit Losses - Summary of Allowance for Credit Losses (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Allowance for credit losses and recorded investment in financing receivables
Balance at January 1	$ 4.6	$ 4.5
Provision for credit losses	(0.1)	0.3
Write-offs	(0.1)	(0.1)
Balance at September 30	4.4	4.7
Finance Leases Financing Receivable [Member]
Allowance for credit losses and recorded investment in financing receivables
Balance at January 1	0.5	0.4
Provision for credit losses	(0.1)	0.3
Write-offs	(0.1)	(0.1)
Balance at September 30	0.3	0.6
Notes Receivable [Member]
Allowance for credit losses and recorded investment in financing receivables
Balance at January 1	4.1	4.1
Provision for credit losses	0.0	0.0
Write-offs	0.0	0.0
Balance at September 30	$ 4.1	$ 4.1