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Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Unrealized gain (loss) on derivatives arising during period, before tax | $ 2.4 | $ 9.6
Other comprehensive income (loss), tax | 0.1 | $ 0.5
Projected amortization of unrealized losses from AOCL to earnings, coming twelve months | $ 0.3 |

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