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2. Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments $ 339.2 $ 211.8
Fair Value, Inputs, Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 160.7 [1] 283.0 [1]
Available-for-sale investments 130.8 [2] 102.2 [2]
Forward foreign exchange contracts 0 [3] 0 [3]
Financial Assets Carried at Fair Value 291.5 385.2
Forward foreign exchange contracts 0 [4] 0 [4]
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0 [1] 0 [1]
Fair Value, Inputs, Level 1 [Member] | Bonds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0 [1]  
Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0 [1]  
Fair Value, Inputs, Level 1 [Member] | Bank Time Deposits [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 31.5 [1] 16.7 [1]
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 129.2 [1] 266.3 [1]
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 0 [2]  
Fair Value, Inputs, Level 1 [Member] | US Government and Government Agencies and Authorities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 1 [Member] | Municipal Bonds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 130.8 [2] 102.2 [2]
Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 0 [2]  
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Backed Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments   0 [2]
Fair Value, Inputs, Level 1 [Member] | Mortgage Backed Securities, Other [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments   0 [2]
Fair Value, Inputs, Level 1 [Member] | Other Debt Obligations [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments   0 [2]
Fair Value, Inputs, Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 127.5 [1] 204.6 [1]
Available-for-sale investments 208.4 [2] 109.6 [2]
Forward foreign exchange contracts 0.7 [3] 0.5 [3]
Financial Assets Carried at Fair Value 336.6 314.7
Forward foreign exchange contracts 6.7 [4] 3.3 [4]
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 107.7 [1] 179.6 [1]
Fair Value, Inputs, Level 2 [Member] | Bonds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 4.8 [1]  
Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 10.0 [1]  
Fair Value, Inputs, Level 2 [Member] | Bank Time Deposits [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 5.0 [1] 25.0 [1]
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0 [1] 0 [1]
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 173.2 [2] 39.8 [2]
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 11.8 [2]  
Fair Value, Inputs, Level 2 [Member] | US Government and Government Agencies and Authorities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 14.3 [2] 54.7 [2]
Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 2.1 [2] 4.5 [2]
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 5.1 [2] 7.7 [2]
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 1.9 [2]  
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments   0.1 [2]
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities, Other [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments   2.5 [2]
Fair Value, Inputs, Level 2 [Member] | Other Debt Obligations [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments   0.3 [2]
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 288.2 [1] 487.6 [1]
Available-for-sale investments 339.2 [2] 211.8 [2]
Forward foreign exchange contracts 0.7 [3] 0.5 [3]
Financial Assets Carried at Fair Value 628.1 699.9
Forward foreign exchange contracts 6.7 [4] 3.3 [4]
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial Paper [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 107.7 [1] 179.6 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Bonds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 4.8 [1]  
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Government Debt Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 10.0 [1]  
Estimate of Fair Value, Fair Value Disclosure [Member] | Bank Time Deposits [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 36.5 [1] 41.7 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Money Market Funds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 129.2 [1] 266.3 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Debt Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 173.2 [2] 39.8 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Certificates of Deposit [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 11.8 [2]  
Estimate of Fair Value, Fair Value Disclosure [Member] | US Government and Government Agencies and Authorities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 14.3 [2] 54.7 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Government Debt Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 2.1 [2] 4.5 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal Bonds [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 5.1 [2] 7.7 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 130.8 [2] 102.2 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 1.9 [2]  
Estimate of Fair Value, Fair Value Disclosure [Member] | Collateralized Mortgage Backed Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments   0.1 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Mortgage Backed Securities, Other [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments   2.5 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Other Debt Obligations [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments   0.3 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Short-term Investments [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments 215.9 118.6
Estimate of Fair Value, Fair Value Disclosure [Member] | Other Assets [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale investments $ 123.3 $ 93.2
[1] Cash equivalents are included in Cash and cash equivalents in the Condensed Consolidated Balance Sheets.
[2] Available-for-sale investments (in millions): June 30, 2011 December 31, 2010    Short-term investments$215.9 $118.6Other assets123.3 93.2Total$339.2 $211.8
[3] Forward foreign exchange contracts in an asset position are included in Prepaid expenses, taxes and other current assets in the Condensed Consolidated Balance Sheets.
[4] Forward foreign exchange contracts in a liability position are included in Other current liabilities in the Condensed Consolidated Balance Sheets.