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Cash Convertible Senior Notes and Related Transactions (Tables) | 12 Months Ended
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Dec. 31, 2011
Cash Convertible Senior Notes and Related Transactions [Abstract] |
Principal amount, carrying amount, and interest expense of the notes | The following tables provide additional information regarding the Notes:
| December 31, 2011 |  | December 31, 2010
Principal amount | $ | 175.0 |  |  | $ | 175.0 |
Less: unamortized issuance discount | $ | (27.0 | ) |  | (33.6 | )
Carrying amount, net of discount | $ | 148.0 |  |  | $ | 141.4 |
| Year Ended
| December 31,
| 2011 |  | 2010
Contractual coupon interest | $ | 8.4 |  |  | $ | 6.0 |
Amortization of discount and deferred financing costs | 7.8 |  |  | 5.3 |
Total interest expense 1 | $ | 16.2 |  |  | $ | 11.3 |
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1 | A portion of the interest relating to the Notes is capitalized as Construction in progress.

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