Accounts Receivable, Net of Allowance (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Schedule of Accounts Receivable, Net of Allowance [Line Items]
Provision for doubtful accounts	$ 0.5	$ 0.6
Financing Receivable [Member]
Schedule of Accounts Receivable, Net of Allowance [Line Items]
Increase in cash collections from non-recourse financing arrangement	$ 33.0