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Long-Term Debt and Credit Facility, Carrying Amount Table (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Principal amount, carrying amount and interest expense of notes |  |  |  |  |  |  |  |  |
Principal amount | $ 225.0 |  |  |  | $ 225.0 |  |  |  | $ 225.0
Carrying amount, net of discount | 0 |  |  |  | 0 |  |  |  | 163.5
Convertible Notes |  |  |  |  |  |  |  |  |
Principal amount, carrying amount and interest expense of notes |  |  |  |  |  |  |  |  |
Principal amount | 175.0 |  |  |  | 175.0 |  |  |  | 175.0
Less: unamortized issuance discount | (4.8) |  |  |  | (4.8) |  |  |  | (11.5)
Carrying amount, net of discount | 170.2 |  |  |  | 170.2 |  |  |  | 163.5
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 | $ 4.6 | [1] | $ 4.3 | [1] | $ 13.5 | [1] | $ 12.8 | [1] |
[1] | A portion of the interest relating to the Convertible Notes was capitalized as Construction in progress.

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