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Debt (Interest Rate Swaps) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Mark-to-market adjustments | $ 16.2 |  | $ (3.1)
Reduction of interest expense | 3.2 | $ 3.4 |
Interest Rate Swaps [Member] |  |  |
Principal amount of note | $ 596.0 |  |

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