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Accounts Receivable (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Valuation allowance and allowance for doubtful accounts |  |  |  |  | $ 0.6 |
Accounts Receivable, Gross, Noncurrent |  |  |  |  |  | $ 38.0
Other long-term liabilities | $ 31.9 |  | $ 31.9 |  | 32.0 |
Government [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts Receivable, Gross, Noncurrent | 78.0 |  | 78.0 |  | 75.0 |
Accounts Receivable, Net, Noncurrent | 23.0 |  | 23.0 |  | 19.9 |
Other long-term liabilities | 19.4 |  | 19.4 |  | $ 19.6 |
Proceeds on claims |  |  | 6.5 |  |  |
Government - portion related to retiree benefits [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts Receivable, Gross, Noncurrent | 42.8 |  | 42.8 |  |  |
Government - portion related to duplicative credit [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts Receivable, Gross, Noncurrent |  |  |  | $ 1.6 |  |
Proceeds on claims |  | $ 1.6 |  |  |  |
Corporation [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts Receivable, Gross, Noncurrent | 3.8 |  | $ 3.8 |  |  |
Proceeds on claims | $ 0.4 |  |  |  |  |

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