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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Long-term Debt |  |
Transfers between Levels 1 and 2, description | The Company did not have transfers between Levels 1 and 2 for either financial assets or liabilities, during the three months ended March 31, 2016 or 2015. |
Fair Value [Member] | Senior Unsecured Notes [Member] |  |
Long-term Debt |  |
Debt | $ 295.5 | $ 305.6
Carrying Value [Member] | Senior Unsecured Notes [Member] |  |
Long-term Debt |  |
Debt | $ 299.1 | $ 299.0

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