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Long-Term Debt and Credit Facility (Tables) | 3 Months Ended
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Mar. 31, 2015
Debt Disclosure [Abstract] |
Principal amount, carrying amount, and interest expense of the notes | The following tables provide additional information regarding the Convertible Notes (in millions of dollars):
| March 31, 2015 |  | December 31, 2014
Principal amount | $ | 175.0 |  |  | $ | 175.0 |
Less: unamortized issuance discount | — |  |  | (2.5 | )
Carrying amount, net of discount | $ | 175.0 |  |  | $ | 172.5 |
| Quarter Ended March 31,
| 2015 |  | 2014
Contractual coupon interest | $ | 2.0 |  |  | $ | 2.0 |
Amortization of discount | 2.4 |  |  | 2.1 |
Amortization of deferred financing costs | 0.3 |  |  | 0.3 |
Total interest expense 1 | $ | 4.7 |  |  | $ | 4.4 |
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1 | A portion of the interest relating to the Convertible Notes was capitalized as construction in progress.

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