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Long-Term Debt and Credit Facility (Tables) | 12 Months Ended
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Dec. 31, 2014
Debt Disclosure [Abstract] |
Principal amount, carrying amount, and interest expense of the notes | The following tables provide additional information regarding the Convertible Notes:
| December 31, 2014 |  | December 31, 2013
Principal amount | $ | 175.0 |  |  | $ | 175.0 |
Less: unamortized issuance discount | (2.5 | ) |  | (11.5 | )
Carrying amount, net of discount | $ | 172.5 |  |  | $ | 163.5 |
| Year Ended December 31,
| 2014 |  | 2013 |  | 2012
Contractual coupon interest | $ | 7.9 |  |  | $ | 7.9 |  |  | $ | 7.9 |
Amortization of discount | 9.1 |  |  | 8.2 |  |  | 7.3 |
Amortization of deferred financing costs | 1.1 |  |  | 1.2 |  |  | 1.2 |
Total interest expense 1 | $ | 18.1 |  |  | $ | 17.3 |  |  | $ | 16.4 |
_______________
1 | A portion of the interest relating to the Convertible Notes was capitalized as Construction in progress.

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