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Long-term Debt (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Debt Instrument |  |  |  |
Total long-term debt | $ 2,073,500,000 |  | $ 2,277,400,000 |
Less: current portion | 1,900,000 | [1] | 216,600,000 | [1]
Long-term debt, excluding current portion | 2,071,600,000 |  | 2,060,800,000 |
Exercised Call Option, Shares, Acquired, Net Share Settlement | 0.8 |  |  |
6.25% Senior Unsecured Notes due 2014 |  |  |  |
Debt Instrument |  |  |  |
Effective Interest Rate | 6.29% |  |  |
Book Value | 352,400,000 |  | 352,800,000 |
Fair Value | 376,800,000 | [2] | 372,600,000 |
Stated Interest Rate | 6.25% |  |  |
Debt Instrument, Unamortized Discount | 200,000 |  |  |
Debt Maturity Date | Nov. 15, 2014 |  |  |
10.00% Senior Unsecured Notes due 2017 |  |  |  |
Debt Instrument |  |  |  |
Effective Interest Rate | 10.38% |  |  |
Book Value | 592,300,000 |  | 591,900,000 |
Fair Value | 642,800,000 | [2] | 660,800,000 |
Stated Interest Rate | 10.00% |  |  |
Debt Instrument, Unamortized Discount | 7,700,000 |  |  |
Debt Maturity Date | Jul. 15, 2017 |  |  |
2.25% Senior Notes due 2017 |  |  |  |
Debt Instrument |  |  |  |
Effective Interest Rate | 2.30% |  |  |
Book Value | 299,300,000 |  | 299,300,000 |
Fair Value | 299,000,000 |  | 297,800,000 |
Stated Interest Rate | 2.25% |  |  |
Debt Instrument, Unamortized Discount | 700,000 |  |  |
Debt Maturity Date | Nov. 15, 2017 |  |  |
4.00% Senior Notes due 2022 |  |  |  |
Debt Instrument |  |  |  |
Effective Interest Rate | 4.13% |  |  |
Book Value | 247,200,000 |  | 247,100,000 |
Fair Value | 252,400,000 | [2] | 258,700,000 |
Stated Interest Rate | 4.00% |  |  |
Debt Instrument, Unamortized Discount | 2,800,000 |  |  |
Debt Maturity Date | Mar. 15, 2022 |  |  |
3.75% Senior Notes due 2023 |  |  |  |
Debt Instrument |  |  |  |
Effective Interest Rate | 4.32% |  |  |
Book Value | 498,500,000 |  | 498,500,000 |
Fair Value | 482,900,000 |  | 499,700,000 |
Stated Interest Rate | 3.75% |  |  |
Debt Instrument, Unamortized Discount | 1,500,000 |  |  |
Debt Maturity Date | Feb. 15, 2013 |  |  |
4.75% Notes |  |  |  |
Debt Instrument |  |  |  |
Book Value | 0 |  | 200,500,000 |
Fair Value | 0 | [2] | 202,800,000 |
Stated Interest Rate | 4.75% |  |  |
Debt Maturity Date | Mar. 15, 2023 |  |  |
4.75% Notes, Amount Retired | 200,000,000 |  |  |
4.75% Notes, Amount Retired for Cash | 199,997,000 |  |  |
Current conversion ratio | 84.3402 |  |  |
Other notes payable and capitalized leases |  |  |  |
Debt Instrument |  |  |  |
Book Value | 83,800,000 |  | 87,300,000 |
Fair Value | $ 83,900,000 | [2] | $ 90,800,000 | [2]
Common Stock |  |  |  |
Debt Instrument |  |  |  |
Conversion of convertible notes to common stock, shares | 16,900,000 |  |  |
[1] | We included our 4.75% Convertible Senior Notes due 2023 (the “4.75% Notes”) in the current portion of long-term debt on our December 31, 2012 Consolidated Balance Sheet because holders of the 4.75% Notes had a repurchase option for cash, stock or a combination, at our election, at par on March 15, 2013. The 4.75% Notes were retired in the first quarter of 2013.
[2] | See Note 11 for information on the fair value measurement of our long-term debt.

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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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- Definition The ratio applied to the debt for purposes of determining the number of shares of the equity security into which the debt will be converted. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Conversion Rate -URI http://asc.fasb.org/extlink&oid=6509012 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 7: 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(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: 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 6: 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 + Details
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