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Long-Term Debt and Credit Facility, Carrying Amount Table (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Principal amount, carrying amount and interest expense of notes |  |  |  |  |  |
Principal amount | $ 225.0 us-gaap_DebtInstrumentFaceAmount |  | $ 225.0 us-gaap_DebtInstrumentFaceAmount |  |  |
Carrying amount, net of discount | 0 us-gaap_ConvertibleDebt |  | 163.5 us-gaap_ConvertibleDebt |  |  |
Convertible Notes |  |  |  |  |  |
Principal amount, carrying amount and interest expense of notes |  |  |  |  |  |
Principal amount | 175.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |  | 175.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |  |  |
Less: unamortized issuance discount | (2.5)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |  | (11.5)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |  |  |
Carrying amount, net of discount | 172.5 us-gaap_ConvertibleDebt / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |  | 163.5 us-gaap_ConvertibleDebt / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |  |  |
Contractual coupon interest | 7.9 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |  | 7.9 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |  | 7.9 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |
Amortization of discount | 9.1 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |  | 8.2 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |  | 7.3 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |
Amortization of deferred financing costs | 1.1 us-gaap_AmortizationOfFinancingCosts / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |  | 1.2 us-gaap_AmortizationOfFinancingCosts / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |  | 1.2 us-gaap_AmortizationOfFinancingCosts / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |
Total interest expense | $ 18.1 us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember | [1] | $ 17.3 us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember | [1] | $ 16.4 us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember | [1]
[1] | A portion of the interest relating to the Convertible Notes was capitalized as Construction in progress.

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