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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Fair Value Measurements (Textuals)    
Amount of restricted investments measured at fair value included in the balance of Corporate Debt Securities $ 1.7 $ 1.6
Amount of restricted investments measured at fair value included in the balance of Money Market Funds 79.2 75.1
Trading securities, amortized cost 11.9 [1] 9.3 [1]
Amount of Restricted Investments Measured at Fair Value Included in Balance of Mutual Funds   1.0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Derivative assets:    
Derivative assets measured at fair value on a recurring basis 2.4 0.4
Total assets measured at fair value 2,733.6 2,810.8
Liabilities measured at fair value:    
Derivative liability measured at fair value on a recurring basis (3.1) (9.6)
Liabilities measured at fair value 3.1 9.6
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Derivative assets:    
Derivative assets measured at fair value on a recurring basis 0 0
Total assets measured at fair value 1,764.8 1,865.1
Liabilities measured at fair value:    
Derivative liability measured at fair value on a recurring basis 0 0
Liabilities measured at fair value 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Derivative assets:    
Derivative assets measured at fair value on a recurring basis 2.4 0.4
Total assets measured at fair value 968.8 945.7
Liabilities measured at fair value:    
Derivative liability measured at fair value on a recurring basis (3.1) (9.6)
Liabilities measured at fair value 3.1 9.6
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Derivative assets:    
Derivative assets measured at fair value on a recurring basis 0 0
Total assets measured at fair value 0 0
Liabilities measured at fair value:    
Derivative liability measured at fair value on a recurring basis 0 0
Liabilities measured at fair value 0 0
Foreign Exchange Contract [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Derivative assets:    
Derivative assets measured at fair value on a recurring basis 2.4 0.4
Liabilities measured at fair value:    
Derivative liability measured at fair value on a recurring basis (3.1) (9.6)
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Derivative assets:    
Derivative assets measured at fair value on a recurring basis 0 0
Liabilities measured at fair value:    
Derivative liability measured at fair value on a recurring basis 0 0
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Derivative assets:    
Derivative assets measured at fair value on a recurring basis 2.4 0.4
Liabilities measured at fair value:    
Derivative liability measured at fair value on a recurring basis (3.1) (9.6)
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Derivative assets:    
Derivative assets measured at fair value on a recurring basis 0 0
Liabilities measured at fair value:    
Derivative liability measured at fair value on a recurring basis 0 0
Available-for-sale Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 2,719.3  
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 1,752.9  
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 966.4  
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0  
Debt Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 2,715.4 2,800.1
Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 1,749.0 1,854.8
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 966.4 945.3
Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 0
US Government Debt Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 376.7 301.0
US Government Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 187.0 149.3
US Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 189.7 151.7
US Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 0
US Government-sponsored Enterprises Debt Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 276.2 431.0
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 252.2 314.2
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 24.0 116.8
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 0
Commercial Paper [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 15.0 10.0
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 0
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 15.0 10.0
Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 0
Corporate Debt Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 570.1 [2] 510.3 [3]
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 [2] 0 [3]
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 570.1 [2] 510.3 [3]
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 [2] 0 [3]
Certificates of Deposit [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 25.6 31.8
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 0
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 25.6 31.8
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 0
Asset-backed Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 142.0 124.7
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 142.0 124.7
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 0
Mutual Funds [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 1.0 [4]  
Trading securities:    
Trading securities measured at fair value on a recurring basis 11.9 [5] 10.3 [6]
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 1.0 [4]  
Trading securities:    
Trading securities measured at fair value on a recurring basis 11.9 [5] 10.3 [6]
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 [4]  
Trading securities:    
Trading securities measured at fair value on a recurring basis 0 [5] 0 [6]
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 [4]  
Trading securities:    
Trading securities measured at fair value on a recurring basis 0 [5] 0 [6]
Money Market Funds [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 1,308.8 [7] 1,391.3 [8]
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 1,308.8 [7] 1,391.3 [8]
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 [7] 0 [8]
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0 [7] 0 [8]
Equity Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 3.9  
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 3.9  
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0  
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Available-for-sale securities:    
Available-for-sale securities measured at fair value on a recurring basis 0  
Trading Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Trading securities:    
Trading securities measured at fair value on a recurring basis 11.9 10.3
Trading Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Trading securities:    
Trading securities measured at fair value on a recurring basis 11.9 10.3
Trading Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Trading securities:    
Trading securities measured at fair value on a recurring basis 0 0
Trading Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Trading securities:    
Trading securities measured at fair value on a recurring basis $ 0 $ 0
[1] Balance includes the Company's non-qualified deferred compensation plan assets. For additional information, see Note 12, Employee Benefit Plans, under the section Deferred Compensation Plan.
[2] Balance includes $1.7 million of restricted investments measured at fair market value, related to the Company's India Gratuity Trust.
[3] Balance includes $1.6 million of restricted investments measured at fair market value, related to the Company's India Gratuity Trust.
[4] Balance relates to the restricted investments measured at fair market value of the Company's India Gratuity Trust.
[5] Balance relates to investments measured at fair value related to the Company's non-qualified deferred compensation plan assets.
[6] Balance includes $9.3 million of the Company's non-qualified deferred compensation plan assets and $1.0 million of restricted investments measured at fair market value, related to the Company's India Gratuity Trust.
[7] Balance includes $79.2 million of restricted investments measured at fair market value, related to the Company's D&O trust and acquisitions related escrows.
[8] Balance includes $75.1 million of restricted investments measured at fair market value, related to the Company's D&O trust and acquisition related escrows.