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Long-term Debt (Details) (USD $) In Millions, except Share data, unless otherwise specified |  |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012 6.25% Senior Unsecured Notes due 2014 | Dec. 31, 2011 6.25% Senior Unsecured Notes due 2014 | Mar. 31, 2012 10.00% Senior Unsecured Notes due 2017 | Dec. 31, 2011 10.00% Senior Unsecured Notes due 2017 | Mar. 31, 2012 4.00% Senior Notes due 2022 | Mar. 02, 2012 4.00% Senior Notes due 2022 | Dec. 31, 2011 4.00% Senior Notes due 2022 | Mar. 31, 2012 4.75% Convertible Senior Notes due 2023 | Mar. 15, 2013 4.75% Convertible Senior Notes due 2023 | Dec. 31, 2011 4.75% Convertible Senior Notes due 2023 | Mar. 31, 2012 4.25% Convertible Senior Notes due 2023 | Mar. 15, 2012 4.25% Convertible Senior Notes due 2023 | Dec. 31, 2011 4.25% Convertible Senior Notes due 2023 | Mar. 31, 2012 Other notes payable and capitalized leases | Dec. 31, 2011 Other notes payable and capitalized leases | Mar. 31, 2012 4.25% Convertible Senior Notes due 2023
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective Interest Rate |  |  |  |  | 6.29% |  |  | 10.38% |  |  | 4.13% |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |  |
Book Value |  |  |  |  | $ 353.9 |  | $ 354.3 | $ 590.9 |  | $ 590.6 | $ 246.9 |  |  | $ 0 | $ 202.2 |  |  | $ 202.7 | $ 0 |  |  | $ 403.0 | $ 65.6 |  | $ 65.1 |
Long-term Debt, Fair Value |  |  |  |  | 382.4 | [1] | 374.5 | 688.5 | [1] | 690.0 | 245.0 | [1] | 246.8 | 0 | 226.5 | [1] |  | 220.5 | 0 | [1] |  | 405.5 | 64.5 | [1] |  |
Total long-term debt | 1,459.5 |  | 1,615.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: current portion | 219.8 | [2] | 404.8 | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, excluding current portion | 1,239.7 |  | 1,210.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized Discount |  |  |  |  | 0.3 |  |  | 9.1 |  |  | 3.1 |  | 3.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized Premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.2 |  |  |  |  |  |  |  |  |  |  |
Stated Interest Rate |  |  |  |  | 6.25% |  |  | 10.00% |  |  | 4.00% |  |  |  | 4.75% |  |  |  | 4.25% |  |  |  |  |  |  |
Debt Maturity Date |  |  |  |  | Nov. 15, 2014 |  |  | Jul. 15, 2017 |  |  | Mar. 15, 2022 |  |  |  | Mar. 15, 2023 |  |  |  | Mar. 15, 2023 |  |  |  |  |  |  |
Repurchase of convertible notes for cash, date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 15, 2013 |  |  |  | Mar. 15, 2012 |  |  |  |  |
4.00% Notes, Face Value |  |  |  |  |  |  |  |  |  |  |  |  | 250.0 |  |  |  |  |  |  |  |  |  |  |  |  |
4.00% Notes, Frequency of Periodic Payment |  |  |  |  |  |  |  |  |  |  | semi-annually |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.00% Notes, Date of First Required Payment |  |  |  |  |  |  |  |  |  |  | September 15, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.00% Notes, Capitalized Direct Fees |  |  |  |  |  |  |  |  |  |  | 2.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase price percentage due to change of control |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.25% Notes, Amount Retired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400.0 |  |  |  |  |  |  |
4.25% Notes, Amount Retired for Cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 399.6 |  |  |  |  |  |  |
4.25% Notes Retirement, Accrued Interest Paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.5 |  |  |  |  |  |  |
Conversion of 4.25% Notes, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.4 |  |  |  |  |  |  |
Conversion of 4.25% Notes, Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000 |  |  |  |  |  |  |
4.25% Notes, Conversion Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82.4612 |  |  |  |  |  |  |
4.25% Notes, Incremental Common Shares if Converted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,000,000
[1] | See Note 10 for information on the fair value measurement of our long-term debt.
[2] | On March 15, 2013, holders of our 4.75% Convertible Senior Notes due 2023 (the “4.75% Notes”) may require us to repurchase their notes for cash at par and as such, we included these notes in the current portion of long-term debt on our March 31, 2012 unaudited Consolidated Balance Sheet. The 4.75% Notes are redeemable in whole or in part at our option beginning March 15, 2013. Any 4.75% Notes not repurchased on March 15, 2013 and not called for redemption by us will be reclassified to long-term debt. On March 15, 2012, holders of our 4.25% Convertible Senior Notes due 2023 (the “4.25% Notes”) could have required us to repurchase their notes for cash at par and therefore, we included these notes in the current portion of long-term debt on our December 31, 2011 Consolidated Balance Sheet.

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- Definition Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 8 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 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) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Total of the portions of the carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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