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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2015
Summary of Carrying Values and Estimated Fair Values of Notes and Facility Financing Obligation | The following is a summary of the carrying values and estimated fair values of the 2015 notes and the facility financing obligation (i.e., the 2019 notes and Tranche B notes) (in millions):
|  | June 30, 2015 |  |  | December 31, 2014 |
|  | Carrying value |  |  | Estimated fair value |  |  | Carrying value |  |  | Estimated fair value |
2015 notes |  | $ | 99.8 |  |  | $ | 103.2 |  |  | $ | 99.4 |  |  | $ | 102.9 |
Facility financing obligation |  | $ | 73.8 |  |  | $ | 77.9 |  |  | $ | 73.0 |  |  | $ | 75.1 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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