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Accounts Receivable (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable, Gross, Noncurrent |  |  | $ 38.0
Other long-term liabilities | $ 31.9 | $ 38.6 |
Government [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable, Gross, Noncurrent |  | 78.0 |
Accounts Receivable, Net, Noncurrent |  | 22.8 |
Other long-term liabilities | 19.4 | 19.3 |
Proceeds on claims |  | 6.7 |
Government - portion related to retiree benefits [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable, Gross, Noncurrent |  | 42.8 |
Corporation [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable, Gross, Noncurrent |  | $ 3.8 |
Proceeds on claims | $ 0.4 |  |

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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 FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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