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Long-Term Debt and Credit Facility (Tables) | 6 Months Ended
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Jun. 30, 2013
Debt Disclosure [Abstract] |  |
Principal amount, carrying amount, and interest expense of the notes | The following tables provide additional information regarding the Convertible Notes:
| June 30, 2013 |  | December 31, 2012
Principal amount | $ | 175.0 |  |  | $ | 175.0 |
Less: unamortized issuance discount | (15.7 | ) |  | (19.7 | )
Carrying amount, net of discount | $ | 159.3 |  |  | $ | 155.3 |
| Quarter Ended June 30, |  | Six Months Ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Contractual coupon interest | $ | 1.9 |  |  | $ | 1.9 |  |  | $ | 3.9 |  |  | $ | 3.9 |
Amortization of discount and deferred financing costs | 2.4 |  |  | 2.1 |  |  | 4.6 |  |  | 4.1 |
Total interest expense 1 | $ | 4.3 |  |  | $ | 4.0 |  |  | $ | 8.5 |  |  | $ | 8.0 |
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1 | A portion of the interest relating to the Convertible Notes is capitalized as Construction in progress.
| [1]
[1] | A portion of the interest relating to the Convertible Notes is 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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