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Debt and Credit Facility (Tables) | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Schedule of additional information regarding the convertible notes | The following table provides additional information regarding the Convertible Notes (in millions of dollars):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Contractual coupon interest | $ | 2.0 |  |  | $ | 7.9 |  |  | $ | 7.9 |
Amortization of discount | 2.4 |  |  | 9.1 |  |  | 8.2 |
Amortization of deferred financing costs | 0.3 |  |  | 1.1 |  |  | 1.2 |
Total interest expense 1 | $ | 4.7 |  |  | $ | 18.1 |  |  | $ | 17.3 |
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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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