v2.4.0.6

Borrowing Arrangements (Details 2) (USD $) | 12 Months Ended |  | 12 Months Ended |  |  | 0 Months Ended | 1 Months Ended |  |  |  | 1 Months Ended |  |  | 1 Months Ended |  |  |  |  | 0 Months Ended | 1 Months Ended |  |  | 12 Months Ended | 1 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Feb. 01, 2013 Subsequent Event | Dec. 31, 2012 Senior Notes | Dec. 31, 2010 Senior Notes | Dec. 31, 2012 6.25% Senior Notes due 2013 | Dec. 31, 2011 6.25% Senior Notes due 2013 | Feb. 01, 2013 6.25% Senior Notes due 2013 Subsequent Event | Dec. 31, 2012 2.00% Senior Notes due 2018 | Dec. 31, 2011 2.00% Senior Notes due 2018 | Dec. 31, 2012 3.25% Senior Notes due 2022 | Dec. 31, 2011 3.25% Senior Notes due 2022 | Aug. 31, 2012 3.25% Senior Notes due 2022 3.25% Senior Notes due 2022, Issued August 2012 | Dec. 31, 2012 3.25% Senior Notes due 2022 3.25% Senior Notes due 2022, Issued December 2012 | Apr. 30, 2012 4.00% Senior Notes due 2019 | Dec. 31, 2012 4.00% Senior Notes due 2019 | Dec. 31, 2011 4.00% Senior Notes due 2019 | Feb. 29, 2012 4.25% senior notes due 2022 | Dec. 31, 2012 4.25% senior notes due 2022 | Dec. 31, 2011 4.25% senior notes due 2022 | Dec. 31, 2012 8.25% Senior Notes, Due 2012 | Dec. 31, 2011 8.25% Senior Notes, Due 2012 | Nov. 15, 2011 3 7/8% Convertible Senior Notes due 2011 upon maturity | Nov. 30, 2011 3 7/8% Convertible Senior Notes due 2011 upon maturity | May 31, 2011 4.750% Senior Notes due 2021 | Dec. 31, 2012 4.750% Senior Notes due 2021 | Dec. 31, 2011 4.750% Senior Notes due 2021 | Dec. 31, 2012 6 1/2% Senior Notes due 2016 | Dec. 31, 2011 6 1/2% Senior Notes due 2016 | Nov. 30, 2011 3.125% Senior Notes due 2015 | Dec. 31, 2012 3.125% Senior Notes due 2015 | Dec. 31, 2011 3.125% Senior Notes due 2015 | Nov. 30, 2010 3.125% Senior Notes due 2015 | Dec. 31, 2012 6 3/4% Senior Notes due 2017 | Dec. 31, 2010 6 3/4% Senior Notes due 2017 | Dec. 31, 2011 6 3/4% Senior Notes due 2017 | Dec. 31, 2010 6 5/8% Senior Notes due 2014 | Dec. 31, 2010 7 1/8% Senior Notes due 2015 | Dec. 31, 2012 NHP | Dec. 31, 2011 NHP 6.50% senior notes due 2011
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount outstanding | $ 8,186,315,000 | $ 6,180,443,000 |  |  |  |  | $ 269,850,000 | $ 269,850,000 |  | $ 700,000,000 | $ 0 | $ 500,000,000 | $ 0 | $ 275,000,000 | $ 225,000,000 | $ 600,000,000 | $ 600,000,000 | $ 0 | $ 600,000,000 | $ 600,000,000 | $ 0 | $ 0 | $ 72,950,000 |  | $ 230,000,000 | $ 700,000,000 | $ 700,000,000 | $ 700,000,000 | $ 0 | $ 200,000,000 |  | $ 400,000,000 | $ 400,000,000 |  | $ 0 |  | $ 225,000,000 |  |  | $ 579,600,000 |
Aggregate shares of common stock issued for the conversion value in excess of the principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 943,714 | 943,714 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed in connection with acquisition | 412,825,000 | 3,651,089,000 | 125,320,000 |  | 3,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of Senior Debt |  |  |  |  |  |  |  |  | 270,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 9.00% |  | 7.125% | 6.25% |  |  | 6.25% | 6.25% |  | 2.00% | 2.00% | 3.25% | 3.25% | 3.25% |  | 400.00% | 4.00% | 4.00% | 4.25% | 4.25% | 4.25% | 8.25% | 8.25% | 3.875% | 3.875% | 4.75% | 4.75% | 4.75% | 6.50% | 6.50% |  | 3.125% | 3.125% | 3.125% | 6.75% | 6.75% | 6.75% | 6.625% |  |  | 6.50%
Redemption price as a percentage of par |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103.25% |  | 99.528% |  |  |  | 103.375% |  |  |  |  |  |
Public offering price as percent of par |  |  |  |  |  |  |  |  |  | 99.739% |  |  |  | 99.027% | 98.509% | 9948.90% |  |  | 99.214% |  |  |  |  |  |  | 99.132% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  | 698,200,000 |  |  |  | 272,300,000 | 221,600,000 | 0 |  |  | 595,300,000 |  |  |  |  |  |  | 693,900,000 |  |  |  |  | 398,100,000 |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount | 155,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400,000 |  | 71,700,000 | 142,700,000 |  | 339,000,000
Senior note redemption price as a percent of par |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103.25% |  |  |  |  |  |  |  | 102.21% | 103.56% |  |
Loss on extinguishment of debt | (37,640,000) | (27,604,000) | (9,791,000) |  | 39,700,000 | 8,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,700,000 |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |

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