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Equity, Stockholders' Equity Activity (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Sep. 30, 2011
Sep. 30, 2010
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, beginning of period$ 6,961,900,000$ 6,896,800,000$ 6,608,800,000$ 6,171,800,000$ 6,121,300,000$ 5,824,765,000$ 6,608,800,000$ 5,824,765,000
Consolidated net income83,671,000115,518,000129,660,000134,337,000130,343,000164,610,000328,849,000429,290,000
Change in net unrealized (loss) gain on investments, net of tax of nil(8,700,000)(1,500,000)4,400,0008,700,000(1,300,000)(400,000)(5,800,000)7,000,000
Change in foreign currency translation adjustment, net of tax of nil(7,500,000)2,600,0006,600,0006,300,000(4,800,000)(2,700,000)1,700,000(1,200,000)
Stock Issued During Period, Value, Employee Stock Purchase Plan28,000,000 23,700,00021,000,000 20,800,000  
Stock Issued During Period, Value, Stock Options Exercised8,300,00037,900,000241,700,00062,400,00053,700,000101,200,000  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders    (1,000,000)(2,000,000)  
Value Shares Assumed In Connection With Business Acquisition    2,300,000   
Common stock repurchased and retired under stock repurchase programs, value(191,000,000)(150,000,000)(200,200,000)(134,900,000)(177,400,000)(74,400,000)(541,200,000)(386,700,000)
Shares Repuchased And Retired Related To Net Issuances(2,400,000) (4,900,000)(100,000) (1,800,000)  
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value59,000,00058,600,00047,600,00043,100,00043,300,00040,600,000  
Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation6,900,0002,000,00039,400,0004,300,0005,400,00050,600,000  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, end of period6,938,184,0006,961,900,0006,896,800,0006,316,900,0006,171,800,0006,121,300,0006,938,184,0006,316,900,000
Common Stock Including Additional Paid in Capital [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, beginning of period10,041,400,0009,998,100,0009,717,800,0009,363,200,0009,267,600,0009,060,089,0009,717,800,0009,060,089,000
Consolidated net income000000  
Change in net unrealized (loss) gain on investments, net of tax of nil000000  
Change in foreign currency translation adjustment, net of tax of nil000000  
Stock Issued During Period, Value, Employee Stock Purchase Plan28,000,000 23,700,00021,000,000 20,800,000  
Stock Issued During Period, Value, Stock Options Exercised8,300,00037,900,000241,700,00062,400,00053,700,000101,200,000  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders    00  
Value Shares Assumed In Connection With Business Acquisition    2,300,000   
Common stock repurchased and retired under stock repurchase programs, value(130,700,000)(55,200,000)(70,300,000)(44,400,000)(9,100,000)(5,700,000)  
Shares Repuchased And Retired Related To Net Issuances(1,200,000) (1,800,000)0 0  
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value59,000,00058,600,00047,600,00043,100,00043,300,00040,600,000  
Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation6,900,0002,000,00039,400,0004,300,0005,400,00050,600,000  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, end of period10,011,700,00010,041,400,0009,998,100,0009,449,600,0009,363,200,0009,267,600,00010,011,700,0009,449,600,000
Accumulated Other Comprehensive Income [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, beginning of period10,800,0009,700,000(1,300,000)(10,600,000)(4,500,000)(1,433,000)(1,300,000)(1,433,000)
Consolidated net income000000  
Change in net unrealized (loss) gain on investments, net of tax of nil(8,700,000)(1,500,000)4,400,0008,700,000(1,300,000)(400,000)  
Change in foreign currency translation adjustment, net of tax of nil(7,500,000)2,600,0006,600,0006,300,000(4,800,000)(2,700,000)  
Stock Issued During Period, Value, Employee Stock Purchase Plan0 00 0  
Stock Issued During Period, Value, Stock Options Exercised000000  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders    00  
Value Shares Assumed In Connection With Business Acquisition    0   
Common stock repurchased and retired under stock repurchase programs, value000000  
Shares Repuchased And Retired Related To Net Issuances0 00 0  
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value000000  
Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation000000  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, end of period(5,400,000)10,800,0009,700,0004,400,000(10,600,000)(4,500,000)(5,400,000)4,400,000
Retained Earnings [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, beginning of period(3,090,700,000)(3,111,500,000)(3,108,300,000)(3,181,700,000)(3,143,900,000)(3,236,525,000)(3,108,300,000)(3,236,525,000)
Consolidated net income83,700,000115,560,000129,750,000134,500,000130,511,000163,115,000  
Change in net unrealized (loss) gain on investments, net of tax of nil000000  
Change in foreign currency translation adjustment, net of tax of nil000000  
Stock Issued During Period, Value, Employee Stock Purchase Plan0 00 0  
Stock Issued During Period, Value, Stock Options Exercised000000  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders    00  
Value Shares Assumed In Connection With Business Acquisition    0   
Common stock repurchased and retired under stock repurchase programs, value(60,300,000)(94,800,000)(129,900,000)(90,500,000)(168,300,000)(68,700,000)  
Shares Repuchased And Retired Related To Net Issuances(1,200,000) (3,100,000)(100,000) (1,800,000)  
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value000000  
Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation 00000  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, end of period(3,068,500,000)(3,090,700,000)(3,111,500,000)(3,137,800,000)(3,181,700,000)(3,143,900,000)(3,068,500,000)(3,137,800,000)
Noncontrolling Interest [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, beginning of period400,000500,000600,000900,0002,100,0002,629,000600,0002,629,000
Consolidated net income8,000(42,000)(90,000)(206,000)(168,000)1,495,000  
Change in net unrealized (loss) gain on investments, net of tax of nil000000  
Change in foreign currency translation adjustment, net of tax of nil000000  
Stock Issued During Period, Value, Employee Stock Purchase Plan0 00 0  
Stock Issued During Period, Value, Stock Options Exercised000000  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders    (1,000,000)(2,000,000)  
Value Shares Assumed In Connection With Business Acquisition    0   
Common stock repurchased and retired under stock repurchase programs, value000000  
Shares Repuchased And Retired Related To Net Issuances0 00 0  
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value000000  
Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation000000  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, end of period$ 400,000$ 400,000$ 500,000$ 700,000$ 900,000$ 2,100,000$ 400,000$ 700,000