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Borrowing Arrangements (Details 2) (USD $)
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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
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Dec. 31, 2011
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Dec. 31, 2010
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Feb. 01, 2013
Subsequent Event
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Dec. 31, 2012
Senior Notes
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Dec. 31, 2010
Senior Notes
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Dec. 31, 2012
6.25% Senior Notes due 2013
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Dec. 31, 2011
6.25% Senior Notes due 2013
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Feb. 01, 2013
6.25% Senior Notes due 2013
Subsequent Event
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Dec. 31, 2012
2.00% Senior Notes due 2018
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Dec. 31, 2011
2.00% Senior Notes due 2018
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Dec. 31, 2012
3.25% Senior Notes due 2022
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Dec. 31, 2011
3.25% Senior Notes due 2022
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Aug. 31, 2012
3.25% Senior Notes due 2022
3.25% Senior Notes due 2022, Issued August 2012
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Dec. 31, 2012
3.25% Senior Notes due 2022
3.25% Senior Notes due 2022, Issued December 2012
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Apr. 30, 2012
4.00% Senior Notes due 2019
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Dec. 31, 2012
4.00% Senior Notes due 2019
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Dec. 31, 2011
4.00% Senior Notes due 2019
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Feb. 29, 2012
4.25% senior notes due 2022
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Dec. 31, 2012
4.25% senior notes due 2022
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Dec. 31, 2011
4.25% senior notes due 2022
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Dec. 31, 2012
8.25% Senior Notes, Due 2012
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Dec. 31, 2011
8.25% Senior Notes, Due 2012
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Nov. 15, 2011
3 7/8% Convertible Senior Notes due 2011 upon maturity
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Nov. 30, 2011
3 7/8% Convertible Senior Notes due 2011 upon maturity
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May 31, 2011
4.750% Senior Notes due 2021
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Dec. 31, 2012
4.750% Senior Notes due 2021
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Dec. 31, 2011
4.750% Senior Notes due 2021
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Dec. 31, 2012
6 1/2% Senior Notes due 2016
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Dec. 31, 2011
6 1/2% Senior Notes due 2016
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Nov. 30, 2011
3.125% Senior Notes due 2015
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Dec. 31, 2012
3.125% Senior Notes due 2015
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Dec. 31, 2011
3.125% Senior Notes due 2015
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Nov. 30, 2010
3.125% Senior Notes due 2015
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Dec. 31, 2012
6 3/4% Senior Notes due 2017
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Dec. 31, 2010
6 3/4% Senior Notes due 2017
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Dec. 31, 2011
6 3/4% Senior Notes due 2017
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Dec. 31, 2010
6 5/8% Senior Notes due 2014
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Dec. 31, 2010
7 1/8% Senior Notes due 2015
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Dec. 31, 2012
NHP
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Dec. 31, 2011
NHP
6.50% senior notes due 2011
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| 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 | ||||||||||||||||||||||||||||||||||||||||