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Debt (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 95 Months Ended | 1 Months Ended | 12 Months Ended | 82 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2004 | Aug. 18, 2011 Interest Rate Swaps on 2016 Notes [Member] | Dec. 31, 2010 Interest Rate Swaps on 2016 Notes [Member] | Dec. 31, 2011 Commercial paper and Credit Agreement [Member] | Dec. 31, 2010 Commercial paper and Credit Agreement [Member] | Dec. 31, 2009 Commercial paper and Credit Agreement [Member] | Dec. 31, 2011 Credit Agreement expiring October 2016 [Member] | Dec. 31, 2010 Credit Agreement expiring December 2013 [Member] | Dec. 31, 2011 Uncommitted lines of credit [Member] | Dec. 31, 2010 Uncommitted lines of credit [Member] | Dec. 31, 2011 Long-Term Notes Payable [Member] | Dec. 31, 2010 Long-Term Notes Payable [Member] | Dec. 31, 2009 Long-Term Notes Payable [Member] | Dec. 31, 2011 5.90% Senior Notes due April 15, 2016 [Member] | Dec. 31, 2010 5.90% Senior Notes due April 15, 2016 [Member] | Dec. 31, 2011 6.25% Senior Notes due July 15, 2019 [Member] | Dec. 31, 2010 6.25% Senior Notes due July 15, 2019 [Member] | Dec. 31, 2011 4.45% Senior Notes due August 15, 2020 [Member] | Dec. 31, 2010 4.45% Senior Notes due August 15, 2020 [Member] | Dec. 31, 2011 Other notes and loans at rates from 2.8% to 9.0%, due through 2013 [Member] | Dec. 31, 2010 Other notes and loans at rates from 2.8% to 9.0%, due through 2013 [Member] | Dec. 31, 2011 Convertible Debt [Member] | Dec. 31, 2010 Convertible Debt [Member] | Dec. 31, 2009 Convertible Debt [Member] | Feb. 28, 2001 Convertible Notes - due February 7, 2031 [Member] | Dec. 31, 2011 Convertible Notes - due February 7, 2031 [Member] | Dec. 31, 2010 Convertible Notes - due February 7, 2031 [Member] | Dec. 31, 2009 Convertible Notes - due February 7, 2031 [Member] | Dec. 31, 2008 Convertible Notes - due February 7, 2031 [Member] | Mar. 31, 2002 Convertible Notes - due July 31, 2032 [Member] | Dec. 31, 2011 Convertible Notes - due July 31, 2032 [Member] | Dec. 31, 2010 Convertible Notes - due July 31, 2032 [Member] | Dec. 31, 2009 Convertible Notes - due July 31, 2032 [Member] | Dec. 31, 2008 Convertible Notes - due July 31, 2032 [Member] | Dec. 31, 2004 Convertible Notes - due July 31, 2032 [Member] Y | Jun. 30, 2006 Convertible Notes - due June 15, 2033 [Member] | Jun. 30, 2003 Convertible Notes - due June 15, 2033 [Member] | Dec. 31, 2011 Convertible Notes - due June 15, 2033 [Member] | Dec. 31, 2010 Convertible Notes - due June 15, 2033 [Member] | Jun. 30, 2010 Convertible Notes - due July 1, 2038 [Member] | Dec. 31, 2011 Convertible Notes - due July 1, 2038 [Member] | Dec. 31, 2010 Convertible Notes - due July 1, 2038 [Member] | Dec. 31, 2009 Convertible Notes - due July 1, 2038 [Member] | Dec. 31, 2004 Convertible Notes - due July 1, 2038 [Member] Y | Dec. 31, 2011 Commercial Paper [Member] Credit Agreement expiring October 2016 [Member]
Lines of Credit [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement, initiation date |  |  |  |  |  |  |  |  |  | October 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement, maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 2,500,000,000 | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000,000
Credit Agreement, expiration date |  |  |  |  |  |  |  |  |  | October 12, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available and unused lines of credit | 3,258,300,000 | 2,610,400,000 |  |  |  |  |  |  |  | 2,500,000,000 | 2,000,000,000 | 758,300,000 | 610,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement, covenant terms |  |  |  |  |  |  |  |  |  | The Credit Agreement contains financial covenants that limit the ratio of total consolidated indebtedness to total consolidated EBITDA (under the Credit Agreement, EBITDA is defined as earnings before interest, taxes, depreciation and amortization) to no more than 3.0 times. We are also required to maintain a minimum ratio of consolidated EBITDA to interest expense of at least 5.0 times. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement, covenant compliance |  |  |  |  |  |  |  |  |  | At December 31, 2011 we were in compliance with these covenants, as our ratio of debt to EBITDA was 1.7 times and our ratio of EBITDA to interest expense was 12.3 times. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings | 9,500,000 | 50,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings, weighted average interest rate | 5.60% | 5.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Notes Payable [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term notes payable, carrying amount | 2,501,300,000 | 2,501,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 | 1,000,000,000 | 500,000,000 | 500,000,000 | 1,000,000,000 | 1,000,000,000 | 1,300,000 | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term notes payable, unamortized discount on Senior Notes | (7,600,000) | (8,700,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term notes payable, deferred gain from termination of interest rate swaps on Senior Notes due 2016 | 30,500,000 | 0 |  |  | 33,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term notes payable, fair value hedge adjustment on Senior Notes due 2016 | 0 | (26,300,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term notes payable, total | 2,524,200,000 | 2,466,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term notes payable, current portion | 700,000 | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Notes Payable | 2,523,500,000 | 2,465,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps, amount of hedged item |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps, proceeds from termination of interest rate swaps | 38,800,000 | 0 | 0 |  | 38,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps, fair value |  |  |  |  |  | 24,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, total | 659,400,000 | 659,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 100,000 |  |  |  | 252,700,000 | 252,700,000 |  |  |  |  |  | 100,000 | 100,000 |  | 406,600,000 | 406,600,000 |  |  |
Convertible debt, current | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt | 659,400,000 | 659,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, issuance of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 850,000,000 |  |  |  |  | 900,000,000 |  |  |  |  |  |  | 600,000,000 |  |  |  |  |  |  |  |
Convertible debt, repayments of convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,700,000 | 841,200,000 | 3,000,000 |  |  |  | 474,300,000 | 173,000,000 |  | 132,500,000 |  |  |  | 60,800,000 |  | 60,800,000 |  |  |
Convertible debt, number of potential common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.6 |  |  |  |  |  |  | 7.9 |  |  |  |  |  |  |
Convertible debt, conversion price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 55.01 |  |  |  |  |  |  | $ 51.50 |  |  |  |  |  |  |
Convertible debt, put terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Holders of these notes have the right to put the notes back to us for cash on July 31 of each year. There are no events that accelerate the noteholders’ put rights. |  |  |  |  |  |  |  |  |  | Holders of these notes have the right to put the notes back to us for cash on June 15, 2013, 2018 and 2023 and on each June 15 annually thereafter through June 15, 2037 and we have a right to redeem the notes for cash on June 17, 2013 and June 15, 2018. After June 15, 2018, we can redeem the 2038 Notes at any time. There are no events that accelerate the noteholders’ put rights. |  |  |  |
Convertible debt, indenture amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | substantially all of the remaining 2033 Notes were amended to extend the maturity of the notes from June 15, 2033 to July 1, 2038. The amendments conformed other terms of the notes for the extension of the maturity date, as well as amending the comparable yield. The amended notes are referred to as our Zero Coupon Zero Yield Convertible Notes due 2038 (“2038 Notes”). |  |  |  | In June 2010, the indenture governing the 2038 Notes was amended. Holders of $403.2 million of the 2038 Notes agreed to waive their right to contingent cash interest, if payable, from December 15, 2010 through and including December 15, 2013. Holders of $3.4 million of the 2038 Notes did not put their notes to us for repurchase and did not consent to the amendment |  |  |  |  |
Convertible debt, equity component |  |  |  | 47,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, equity component, net of tax |  |  |  | 28,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, equity component, amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  | 1.6 |
Convertible debt, supplemental interest paid | 0 | 25,900,000 | 35,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 27,600,000 |  |  |  | 5,700,000 | 7,600,000 |  |  |  |  |  |  |  |  | 20,200,000 | 0 |  |
Long-Term Notes Payable and Convertible Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.90% |  | 6.25% |  | 4.45% |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  | 0.00% |  |  | 0.00% |  |  |  |
Interest rate, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 15, 2016 |  | Jul. 15, 2019 |  | Aug. 15, 2020 |  |  |  |  |  |  |  | Feb. 07, 2031 |  |  |  |  | Jul. 31, 2032 |  |  |  |  |  |  | Jun. 15, 2033 |  |  |  |  |  |  |
Maturity date range, end |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of Interest Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, debt |  |  |  |  |  |  | 2,500,000 | 1,800,000 | 5,700,000 |  |  |  |  | 125,800,000 | 106,700,000 | 78,000,000 |  |  |  |  |  |  |  |  | 10,000,000 | 10,500,000 | 22,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, fees | 7,100,000 | 5,700,000 | 5,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, other | 12,700,000 | 10,000,000 | 10,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, total | 158,100,000 | 134,700,000 | 122,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated Maturities of Long-Term Notes Payable and Convertible Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated maturities of long-term notes payable and convertible debt, 2012 | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated maturities of long-term notes payable and convertible debt, 2013 | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated maturities of long-term notes payable and convertible debt, 2014 | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated maturities of long-term notes payable and convertible debt, 2015 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated maturities of long-term notes payable and convertible debt, 2016 | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated maturities of long-term notes payable and convertible debt, Thereafter | 2,159,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated maturities of long-term notes payable and convertible debt, Total | $ 3,160,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Convertible debt, indenture amendment + References No definition available. + Details
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- Definition Convertible debt, put terms + References No definition available. + Details
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- Definition Remaining amortization period for any discount on the equity component of convertible debt which may be settled in cash upon conversion. + References No definition available. + Details
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- Definition Fair value hedge adjustment on Senior Notes due 2016 + References No definition available. + Details
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- Definition Proceeds from termination of interest rate swaps + References No definition available. + Details
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- Definition The amount of cash paid during the current period for supplemental interest on convertible debt. + References No definition available. + Details
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