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Long-Term Debt and Credit Facility (Tables) | 9 Months Ended
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Sep. 30, 2015
Debt Disclosure [Abstract] |
Principal amount, carrying amount, and interest expense of the notes | The following table provides additional information regarding the Convertible Notes (in millions of dollars):
| Quarter Ended September 30, |  | Nine Months Ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Contractual coupon interest | $ | — |  |  | $ | 2.0 |  |  | $ | 2.0 |  |  | $ | 5.9 |
Amortization of discount | — |  |  | 2.3 |  |  | 2.4 |  |  | 6.7 |
Amortization of deferred financing costs | — |  |  | 0.3 |  |  | 0.3 |  |  | 0.9 |
Total interest expense 1 | $ | — |  |  | $ | 4.6 |  |  | $ | 4.7 |  |  | $ | 13.5 |
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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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