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Accounts Receivable (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Valuation allowance and allowance for doubtful accounts | $ 0.6 | $ 0.6
Other long-term liabilities | 53.7 | 54.6
Government [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, Gross, Noncurrent | 75.0 | 75.0
Accounts Receivable, Net, Noncurrent | 19.9 | 19.9
Other long-term liabilities | $ 19.5 | $ 19.6

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- Definition Amounts due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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