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Cash Convertible Senior Notes and Related Transactions, Carrying Amount Table (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011
Principal amount, carrying amount and interest expense of notes |  |  |  |  |
Carrying amount, net of discount | $ 149.8 |  |  |  | $ 148.0
Convertible Debt |  |  |  |  |
Principal amount, carrying amount and interest expense of notes |  |  |  |  |
Principal amount | 175.0 |  |  |  | 175.0
Less: unamortized issuance discount | (25.2) |  |  |  | (27.0)
Carrying amount, net of discount | 149.8 |  |  |  | 148.0
Contractual coupon interest | 2.0 |  | 2.0 |  |
Amortization of discount and deferred financing costs | 2.0 |  | 1.9 |  |
Total interest expense | $ 4.0 | [1] | $ 3.9 | [1] |
[1] | A portion of the interest relating to the Notes is capitalized as Construction in progress

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- Definition Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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