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Income Taxes (Details) (USD $) | 3 Months Ended | 12 Months Ended | 95 Months Ended | 12 Months Ended | 82 Months Ended | 1 Months Ended | 12 Months Ended
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Mar. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | 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] | Dec. 31, 2009 Convertible Notes - due July 31, 2032 [Member] | Dec. 31, 2008 Convertible Notes - due July 31, 2032 [Member] | Jun. 30, 2010 Convertible Notes - due July 1, 2038 [Member] | Dec. 31, 2010 Convertible Notes - due July 1, 2038 [Member]
Income Before Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes, Domestic |  | $ 581,000,000 | $ 573,200,000 | $ 598,800,000 |  |  |  |  |  |  |
Income before income taxes, International |  | 968,000,000 | 777,200,000 | 675,400,000 |  |  |  |  |  |  |
INCOME BEFORE INCOME TAXES AND INCOME FROM EQUITY METHOD INVESTMENTS |  | 1,549,000,000 | 1,350,400,000 | 1,274,200,000 |  |  |  |  |  |  |
Income Tax Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income tax expense, current, Federal |  | 158,600,000 | 107,200,000 | 58,200,000 |  |  |  |  |  |  |
Income tax expense, current, State and local |  | 14,400,000 | 11,700,000 | 11,800,000 |  |  |  |  |  |  |
Income tax expense, current, International |  | 239,500,000 | 233,100,000 | 198,500,000 |  |  |  |  |  |  |
Income tax expense, current |  | 412,500,000 | 352,000,000 | 268,500,000 |  |  |  |  |  |  |
Income tax expense, deferred, Federal |  | 83,600,000 | 98,900,000 | 146,900,000 |  |  |  |  |  |  |
Income tax expense, deferred, State and local |  | 4,900,000 | 3,600,000 | 14,200,000 |  |  |  |  |  |  |
Income tax expense, deferred, International |  | 4,800,000 | 5,700,000 | 4,000,000 |  |  |  |  |  |  |
Income tax expense, deferred |  | 93,300,000 | 108,200,000 | 165,100,000 |  |  |  |  |  |  |
Income tax expense |  | 505,800,000 | 460,200,000 | 433,600,000 |  |  |  |  |  |  |
Reconciliation from the Statutory U.S. Federal Income Tax Rate to Effective Tax Rate [Abstract] |  |  |  |  |  |  |  |  |  |  |
Effective income tax rate reconciliation, Statutory U.S. federal income tax rate |  | 35.00% | 35.00% | 35.00% |  |  |  |  |  |  |
Effective income tax rate reconciliation, State and local taxes on income, net of federal income tax benefit |  | 0.80% | 0.70% | 1.30% |  |  |  |  |  |  |
Effective income tax rate reconciliation, Remeasurement gain Clemenger Group, tax rate differential |  | (2.60%) | 0.00% | 0.00% |  |  |  |  |  |  |
Effective income tax rate reconciliation, International subsidiaries’ tax rate differentials |  | (1.40%) | (2.10%) | (2.70%) |  |  |  |  |  |  |
Effective income tax rate reconciliation, Other |  | 0.90% | 0.50% | 0.40% |  |  |  |  |  |  |
Effective income tax rate reconciliation, Effective rate |  | 32.70% | 34.10% | 34.00% |  |  |  |  |  |  |
Tax benefit related to charges incurred in connection with repositioning actions | (39,500,000) |  |  |  |  |  |  |  |  |  |
Tax provision related to remeasurement gain | 2,800,000 |  |  |  |  |  |  |  |  |  |
Tax accrual for agreed upon adjustments to income tax returns currently under examination | 9,000,000 |  |  |  |  |  |  |  |  |  |
Unrecognized Tax Benefits, Penalties and Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  | 2,800,000 | 3,900,000 | 3,800,000 |  |  |  |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 10,700,000 | 13,000,000 |  |  |  |  |  |  |  |
Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets, Compensation and severance |  | 291,500,000 | 257,600,000 |  |  |  |  |  |  |  |
Deferred tax assets, Tax loss and credit carryforwards |  | 156,300,000 | 112,600,000 |  |  |  |  |  |  |  |
Deferred tax assets, Basis differences arising from acquisitions |  | 37,200,000 | 23,800,000 |  |  |  |  |  |  |  |
Deferred tax assets, Basis differences from short-term assets and liabilities |  | 33,600,000 | 27,700,000 |  |  |  |  |  |  |  |
Deferred tax assets, Other |  | 19,800,000 | 9,800,000 |  |  |  |  |  |  |  |
Deferred tax assets |  | 538,400,000 | 431,500,000 |  |  |  |  |  |  |  |
Deferred tax assets, Valuation allowance |  | (24,900,000) | (24,600,000) |  |  |  |  |  |  |  |
Deferred tax assets, Net deferred tax assets |  | 513,500,000 | 406,900,000 |  |  |  |  |  |  |  |
Deferred tax liabilities, Basis differences arising from investments |  | 11,100,000 | 6,700,000 |  |  |  |  |  |  |  |
Deferred tax liabilities, Unremitted foreign earnings |  | 143,200,000 | 85,000,000 |  |  |  |  |  |  |  |
Deferred tax liabilities, Financial instruments |  | 480,300,000 | 458,200,000 |  |  |  |  |  |  |  |
Deferred tax liabilities, Goodwill and intangible assets |  | 577,400,000 | 449,200,000 |  |  |  |  |  |  |  |
Deferred tax liabilities |  | 1,212,000,000 | 999,100,000 |  |  |  |  |  |  |  |
Net deferred tax assets (liabilities) |  | (698,500,000) | (592,200,000) |  |  |  |  |  |  |  |
Net deferred tax assets and (liabilities), classified [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other current assets - Deferred taxes |  | 169,100,000 | 141,300,000 |  |  |  |  |  |  |  |
Deferred tax assets |  | 0 | 14,200,000 |  |  |  |  |  |  |  |
Long-term deferred tax liabilities |  | (867,600,000) | (747,700,000) |  |  |  |  |  |  |  |
Convertible debt, repayments of convertible debt |  |  |  |  | 5,700,000 | 841,200,000 | 3,000,000 | 474,300,000 | 173,000,000 | 60,800,000 | 60,800,000
Convertible debt, repayments of convertible debt, deferred tax liability |  |  | 12,000,000 | 328,000,000 |  |  |  |  |  |  |
Reduction of deferred tax assets, utilization of tax loss and credit carryforwards |  |  | 30,500,000 |  |  |  |  |  |  |  |
Reduction of deferred tax assets, tax loss and credit carryforwards unable to be utilized |  |  | 39,000,000 |  |  |  |  |  |  |  |
Tax loss and credit carryforwards, expiration dates |  | 5 to 20 years |  |  |  |  |  |  |  |  |
Cumulative undistributed earnings of certain foreign subsidiaries indefinitely reinvested |  | 1,000,000,000 |  |  |  |  |  |  |  |  |
Cumulative undistributed earnings of certain foreign subsidiaries not deemed to be indefinitely reinvested |  | 1,500,000,000 |  |  |  |  |  |  |  |  |
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits, Balance January 1 | 165,100,000 | 165,100,000 | 202,800,000 |  |  |  |  |  |  |  |
Unrecognized tax benefits, Current year tax positions |  | 12,200,000 | 11,400,000 |  |  |  |  |  |  |  |
Unrecognized tax benefits, Prior year tax positions |  | 12,500,000 | 18,300,000 |  |  |  |  |  |  |  |
Unrecognized tax benefits, Reduction of prior year tax positions |  | (14,800,000) | (38,800,000) |  |  |  |  |  |  |  |
Unrecognized tax benefits, Settlements |  | (16,700,000) | (24,100,000) |  |  |  |  |  |  |  |
Unrecognized tax benefits, Lapse of statute of limitations |  | 0 | (2,600,000) |  |  |  |  |  |  |  |
Unrecognized tax benefits, Foreign currency translation |  | (500,000) | (1,900,000) |  |  |  |  |  |  |  |
Unrecognized tax benefits, Balance December 31 |  | 157,800,000 | 165,100,000 | 202,800,000 |  |  |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | $ 62,400,000 | $ 72,400,000 |  |  |  |  |  |  |  |

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- Definition The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(3) -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 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph c -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 FASB Interpretation (FIN) -Number 48 -Paragraph 15, 16 -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 FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph c -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 FASB Interpretation (FIN) -Number 48 -Paragraph 15, 16 -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 FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(2) -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 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(1) -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 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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