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Accounts Receivable, Net of Allowance (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Change in Accounting Estimate [Line Items] |  |  |  |
Provisions for doubtful accounts | $ 1.4 | $ 0.3 | $ 2.2 | $ 1.1
Financing Receivable [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Increase in cash collections from non-recourse financing arrangement |  |  | 29.0 |
Financing Receivable [Member] | Interest Expense [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Non-recourse financing arrangement, discount charge |  |  | $ 1.1 |
Uncollectible Receivables [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Change in estimate, provision for doubtful accounts |  |  |  | $ 0.5

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- Definition Reflects the net positive or negative amount derived from subtracting from net proceeds of sale, the carrying amounts, net of allocated reserves, of accounts receivable transferred to a third party in a transaction that qualifies for sales treatment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=51814546&loc=d3e107425-111719 + Details
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