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Long-Term Debt and Credit Facility (Tables) | 9 Months Ended
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Sep. 30, 2014
Debt Disclosure [Abstract] |
Principal amount, carrying amount, and interest expense of the notes | The following tables provide additional information regarding the Convertible Notes:
| September 30, 2014 |  | December 31, 2013
Principal amount | $ | 175.0 |  |  | $ | 175.0 |
Less: unamortized issuance discount | (4.8 | ) |  | (11.5 | )
Carrying amount, net of discount | $ | 170.2 |  |  | $ | 163.5 |
| Quarter Ended September 30, |  | Nine Months Ended September 30,
| 2014 |  | 2013 |  | 2014 |  | 2013
Contractual coupon interest | $ | 2.0 |  |  | $ | 2.0 |  |  | $ | 5.9 |  |  | $ | 5.9 |
Amortization of discount | 2.3 |  |  | 2.0 |  |  | 6.7 |  |  | 6.0 |
Amortization of deferred financing costs | 0.3 |  |  | 0.3 |  |  | 0.9 |  |  | 0.9 |
Total interest expense 1 | $ | 4.6 |  |  | $ | 4.3 |  |  | $ | 13.5 |  |  | $ | 12.8 |
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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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- Definition Principal amount, carrying amount, and interest expense of the notes. + References No definition available. + Details
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