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Debt and Credit Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2012
Debt Disclosure [Abstract] |
Summary of Carrying Amounts and Fair Values of Long-term Debt | A summary of the carrying amounts and fair values of our long-term debt is listed below.
| Effective Interest Rate |  | December 31,
2012 |  | 2011
| Book Value |  |  | Fair Value 1 |  | Book Value |  |  | Fair Value
6.25% Senior Unsecured Notes due 2014 (less unamortized discount of $0.2) | 6.29 | % |  | $ | 352.8 |  |  | $ | 372.6 |  |  | $ | 354.3 |  |  | $ | 374.5 |
10.00% Senior Unsecured Notes due 2017 (less unamortized discount of $8.1) | 10.38 | % |  | 591.9 |  |  | 660.8 |  |  | 590.6 |  |  | 690.0 |
2.25% Senior Notes due 2017 (less unamortized discount of $0.7) | 2.30 | % |  | 299.3 |  |  | 297.8 |  |  | 0.0 |  |  | 0.0 |
4.00% Senior Notes due 2022 (less unamortized discount of $2.9) | 4.13 | % |  | 247.1 |  |  | 258.7 |  |  | 0.0 |  |  | 0.0 |
3.75% Senior Notes due 2023 (less unamortized discount of $1.5) | 4.32 | % |  | 498.5 |  |  | 499.7 |  |  | 0.0 |  |  | 0.0 |
4.75% Convertible Senior Notes due 2023 (plus unamortized premium of $0.5) 2 | 3.50 | % |  | 200.5 |  |  | 202.8 |  |  | 202.7 |  |  | 220.5 |
4.25% Convertible Senior Notes due 2023 |  |  | 0.0 |  |  | 0.0 |  |  | 403.0 |  |  | 405.5 |
Other notes payable and capitalized leases |  |  | 87.3 |  |  | 90.8 |  |  | 65.1 |  |  |
Total long-term debt |  |  | 2,277.4 |  |  |  |  | 1,615.7 |  |  |
Less: current portion 3 |  |  | 216.6 |  |  |  |  | 404.8 |  |  |
Long-term debt, excluding current portion |  |  | $ | 2,060.8 |  |  |  |  | $ | 1,210.9 |  |  |
1 | See Note 11 for information on the fair value measurement of our long-term debt.
2 | See Note 17 for further information regarding subsequent events.
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.
Annual Maturities of Long-term Debt | Annual maturities are scheduled as follows based on the book value as of December 31, 2012.
2013 1 | $ | 16.1 |
2014 | 352.8 |
2015 | 0.1 |
2016 | 0.1 |
2017 | 913.8 |
Thereafter | 994.5 |
Total long-term debt | $ | 2,277.4 |
1 | Holders of our 4.75% Notes may require us to repurchase their notes for cash, stock or a combination, at our election, at par in March 2013.
Conversion Rates and Conversion Prices for 4.75% Notes | The conversion rates, corresponding conversion prices and conversion shares for our 4.75% Notes are listed below.
|  | December 31,
|  | 2012 |  | 2011 |  | 2010
Conversion price |  | $ | 11.86 |  |  | $ | 12.13 |  |  | $ | 12.42 |
Conversion rate per note (actual number) |  | 84.3402 |  |  | 82.4612 |  |  | 80.5153 |
Conversion shares |  | 16.9 |  |  | 16.5 |  |  | 16.1 |
Strike Price and Cap Price for Capped Call Transaction | The strike price and cap price related to the capped call options are listed below.
|  | December 31,
|  | 2012 |  | 2011 |  | 2010
Strike price |  | $ | 11.86 |  |  | $ | 12.13 |  |  | $ | 12.42 |
Cap price |  | $ | 17.43 |  |  | $ | 17.83 |  |  | $ | 18.26 |
Summary of Credit Facilities | A summary of our credit facilities is presented below.
|  | December 31,
|  | 2012 |  | 2011
|  | Total Facility |  | Amount Outstanding |  | Letters of Credit |  | Total Available |  | Total Facility |  | Amount Outstanding |  | Letters of Credit |  | Total Available
Committed credit agreement |  | $ | 1,000.0 |  |  | $ | 0.0 |  |  | $ | 15.1 |  |  | $ | 984.9 |  |  | $ | 1,000.0 |  |  | $ | 0.0 |  |  | $ | 16.2 |  |  | $ | 983.8 |
Uncommitted credit agreements |  | $ | 317.2 |  |  | $ | 172.1 |  |  | $ | 3.3 |  |  | $ | 141.8 |  |  | $ | 458.3 |  |  | $ | 153.5 |  |  | $ | 2.6 |  |  | $ | 302.2 |
Summary of Financial Covenants in Credit Agreement | The table below sets forth the financial covenants in effect as of December 31, 2012 and thereafter.
Interest coverage ratio (not less than): 1 |  | 5.00x
Leverage ratio (not greater than): 2 |  | 2.75x
1 | The interest coverage ratio is defined as EBITDA, as defined in the Credit Agreement, to net interest expense plus cash dividends on convertible preferred stock for the four quarters then ended.
2 | The leverage ratio is defined as debt as of the last day of such fiscal quarter to EBITDA, as defined in the Credit Agreement, for the four quarters then ended.

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: 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 2: 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 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 10: 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 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 + Details
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