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Long-term Debt (Details) (USD $) In Millions, unless otherwise specified |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 6.25% Senior Unsecured Notes due 2014 | Dec. 31, 2011 6.25% Senior Unsecured Notes due 2014 | Dec. 31, 2012 10.00% Senior Unsecured Notes due 2017 | Dec. 31, 2011 10.00% Senior Unsecured Notes due 2017 | Dec. 31, 2012 2.25% Senior Notes due 2017 | Nov. 08, 2012 2.25% Senior Notes due 2017 | Dec. 31, 2011 2.25% Senior Notes due 2017 | Dec. 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 | Dec. 31, 2012 3.75% Senior Notes due 2023 | Nov. 08, 2012 3.75% Senior Notes due 2023 | Dec. 31, 2011 3.75% Senior Notes due 2023 | Dec. 31, 2012 4.75% Convertible Senior Notes due 2023 | Dec. 31, 2011 4.75% Convertible Senior Notes due 2023 | Dec. 31, 2012 4.25% Convertible Senior Notes due 2023 | Dec. 31, 2011 4.25% Convertible Senior Notes due 2023 | Dec. 31, 2012 Other notes payable and capitalized leases | Dec. 31, 2011 Other notes payable and capitalized leases | Dec. 31, 2012 7.25% Senior Notes due 2011
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective Interest Rate |  |  |  |  | 6.29% |  |  | 10.38% |  |  | 2.30% |  |  |  | 4.13% |  |  |  | 4.32% |  |  |  | 3.50% |  |  |  |  |  |  |  |  |
Stated Interest Rate |  |  |  |  | 6.25% |  |  | 10.00% |  |  | 2.25% |  |  |  | 4.00% |  |  |  | 3.75% |  |  |  | 4.75% |  |  | 4.25% |  |  |  |  |  | 7.25%
Book Value |  |  |  |  | $ 352.8 |  | $ 354.3 | $ 591.9 |  | $ 590.6 | $ 299.3 |  |  | $ 0 | $ 247.1 |  |  | $ 0 | $ 498.5 |  |  | $ 0 | $ 200.5 | [1] | $ 202.7 | $ 0 |  | $ 403.0 | $ 87.3 |  | $ 65.1 |
Fair Value |  |  |  |  | 372.6 | [2] | 374.5 | 660.8 | [2] | 690.0 | 297.8 | [2] |  | 0 | 258.7 | [2] |  | 0 | 499.7 | [2] |  | 0 | 202.8 | [2] | 220.5 | 0 | [2] | 405.5 | 90.8 | [2] |  |
Total long-term debt | 2,277.4 |  | 1,615.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: current portion | 216.6 | [1],[3] | 404.8 | [1],[3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, excluding current portion | 2,060.8 |  | 1,210.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face Value |  |  |  |  |  |  |  | 600.0 |  |  | 300.0 |  |  |  | 250.0 |  |  |  | 500.0 |  |  |  | 200.0 |  |  |  |  |  |  |  |  |
Debt Maturity Date |  |  |  |  | Nov. 15, 2014 |  |  | Jul. 15, 2017 |  |  | Nov. 15, 2017 |  |  |  | Mar. 15, 2022 |  |  |  | Feb. 15, 2023 |  |  |  | Mar. 15, 2023 |  |  | Mar. 15, 2023 |  |  |  |  |  | Aug. 15, 2011
Unamortized Discount |  |  |  |  | 0.2 |  |  | 8.1 |  |  | 0.7 |  | 0.7 |  | 2.9 |  | 3.2 |  | 1.5 |  | 1.5 |  |  |  |  |  |  |  |  |  |  |
Unamortized Premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.5 |  |  |  |  |  |  |  |  |
[1] | See Note 17 for further information regarding subsequent events.
[2] | See Note 11 for information on the fair value measurement of our long-term debt.
[3] | 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, stock or a combination, at our election, at par, and accordingly, we included these notes in the current portion of long-term debt on our December 31, 2012 Consolidated Balance Sheet. We included our 4.25% Convertible Senior Notes due 2023 (the “4.25% Notes”) in the current portion of long-term debt on our December 31, 2011 Consolidated Balance Sheet because holders of the 4.25% Notes had a repurchase option on March 15, 2012 for cash at par. The 4.25% Notes were retired in the first quarter of 2012.

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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