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2. Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Available-for-sale investments$ 349.1$ 211.8
Fair Value, Inputs, Level 1 [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Cash equivalents181.5[1]283.0[1]
Available-for-sale investments116.4[2]102.2[2]
Forward foreign exchange contracts0[3]0[3]
Financial Assets Carried at Fair Value297.9385.2
Forward foreign exchange contracts0[4]0[4]
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Cash equivalents0[1]0[1]
Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt Securities [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Cash equivalents0[1] 
Fair Value, Inputs, Level 1 [Member] | Bank Time Deposits [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Cash equivalents31.8[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 equivalents149.7[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 investments0[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 investments0[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 investments0[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 investments0[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 investments0[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 investments116.4[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 investments0[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 equivalents77.4[1]204.6[1]
Available-for-sale investments232.7[2]109.6[2]
Forward foreign exchange contracts3.8[3]0.5[3]
Financial Assets Carried at Fair Value313.9314.7
Forward foreign exchange contracts1.0[4]3.3[4]
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Cash equivalents72.4[1]179.6[1]
Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Cash equivalents5.0[1] 
Fair Value, Inputs, Level 2 [Member] | Bank Time Deposits [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Cash equivalents0[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 equivalents0[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 investments193.9[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 investments6.8[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 investments18.0[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 investments6.3[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 investments5.0[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 investments0[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 investments2.7[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 equivalents258.9[1]487.6[1]
Available-for-sale investments349.1[2]211.8[2]
Forward foreign exchange contracts3.8[3]0.5[3]
Financial Assets Carried at Fair Value611.8699.9
Forward foreign exchange contracts1.0[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 equivalents72.4[1]179.6[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 equivalents5.0[1] 
Estimate of Fair Value, Fair Value Disclosure [Member] | Bank Time Deposits [Member]
  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Cash equivalents31.8[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 equivalents149.7[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 investments193.9[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 investments6.8[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 investments18.0[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 investments6.3[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 investments5.0[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 investments116.4[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 investments2.7[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 investments239.2118.6
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$ 109.9$ 93.2
[1]Cash equivalents are included in Cash and cash equivalents in the Condensed Consolidated Balance Sheets.
[2]Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): September 30, 2011 December 31, 2010Short-term investments$239.2 $118.6Other assets109.9 93.2Total$349.1 $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.