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3. Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments $ 675.7 $ 366.0
US Government Sponsored Agencies [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 1.3 [1]  
Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 15.6 [1] 79.9 [1]
Available-for-sale investments 242.1 [2] 134.8 [2]
Forward foreign exchange contracts, Asset 0 [3] 0 [3]
Financial Assets Carried at Fair Value 257.7 214.7
Forward foreign exchange contracts, Liability 0 [4] 0 [4]
Contingent Consideration 0 [5] 0 [5]
Liabilities, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 1 [Member] | Foreign Brokered Certificates of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Agencies [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 1 [Member] | Foreign Government Obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 1 [Member] | Municipal Obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 1 [Member] | Marketable Equity Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 242.1 [2] 134.8 [2]
Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 [1] 0 [1]
Fair Value, Inputs, Level 1 [Member] | Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents   0 [1]
Fair Value, Inputs, Level 1 [Member] | Foreign Time Deposits [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 10.1 [1] 21.6 [1]
Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Agencies [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 [1]  
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 5.5 [1] 58.3 [1]
Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 54.1 [1] 114.6 [1]
Available-for-sale investments 433.6 [2] 231.2 [2]
Forward foreign exchange contracts, Asset 1.1 [3] 0.8 [3]
Financial Assets Carried at Fair Value 488.8 346.6
Forward foreign exchange contracts, Liability 0.8 [4] 1.2 [4]
Contingent Consideration 0 [5] 0 [5]
Liabilities, Fair Value Disclosure 0.8 1.2
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 240.6 [2] 170.6 [2]
Fair Value, Inputs, Level 2 [Member] | Foreign Brokered Certificates of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0.4 [2] 1.8 [2]
Fair Value, Inputs, Level 2 [Member] | US Government Sponsored Agencies [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 92.7 [2] 36.9 [2]
Fair Value, Inputs, Level 2 [Member] | Foreign Government Obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 5.6 [2] 5.7 [2]
Fair Value, Inputs, Level 2 [Member] | Municipal Obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 12.1 [2] 5.0 [2]
Fair Value, Inputs, Level 2 [Member] | Marketable Equity Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 82.2 [2] 11.2 [2]
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 52.8 [1] 106.0 [1]
Fair Value, Inputs, Level 2 [Member] | Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents   8.6 [1]
Fair Value, Inputs, Level 2 [Member] | Foreign Time Deposits [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 [1] 0 [1]
Fair Value, Inputs, Level 2 [Member] | US Government Sponsored Agencies [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 1.3 [1]  
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 [1] 0 [1]
Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 [1] 0 [1]
Available-for-sale investments 0 [2] 0 [2]
Forward foreign exchange contracts, Asset 0 [3]  
Financial Assets Carried at Fair Value 0 0
Forward foreign exchange contracts, Liability 0 [4] 0 [4]
Contingent Consideration 52.6 [5] 24.1 [5]
Liabilities, Fair Value Disclosure 52.6 24.1
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 3 [Member] | Foreign Brokered Certificates of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 3 [Member] | US Government Sponsored Agencies [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 3 [Member] | Foreign Government Obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 3 [Member] | Municipal Obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 3 [Member] | Marketable Equity Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0 [2] 0 [2]
Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 [1] 0 [1]
Fair Value, Inputs, Level 3 [Member] | Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents   0 [1]
Fair Value, Inputs, Level 3 [Member] | Foreign Time Deposits [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 [1] 0 [1]
Fair Value, Inputs, Level 3 [Member] | US Government Sponsored Agencies [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 [1]  
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 [1] 0 [1]
Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 69.7 [1] 194.5 [1]
Available-for-sale investments 675.7 [2] 366.0 [2]
Forward foreign exchange contracts, Asset 1.1 [3] 0.8 [3]
Financial Assets Carried at Fair Value 746.5 561.3
Forward foreign exchange contracts, Liability 0.8 [4] 1.2 [4]
Contingent Consideration 52.6 [5] 24.1 [5]
Liabilities, Fair Value Disclosure 53.4 25.3
Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Debt Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 240.6 [2] 170.6 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Brokered Certificates of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0.4 [2] 1.8 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | US Government Sponsored Agencies [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 92.7 [2] 36.9 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Government Obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 5.6 [2] 5.7 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal Obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 12.1 [2] 5.0 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Marketable Equity Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 242.1 [2] 134.8 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 82.2 [2] 11.2 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial Paper [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 52.8 [1] 106.0 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents   8.6 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Time Deposits [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 10.1 [1] 21.6 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Money Market Funds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 5.5 [1] 58.3 [1]
Other Current Liabilities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current liabilities 27.3 8.5
Short-term Investments [Member] | Corporate Debt Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 240.6 170.6
Short-term Investments [Member] | Foreign Brokered Certificates of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0.4 1.8
Short-term Investments [Member] | US Government Sponsored Agencies [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 92.7 36.9
Short-term Investments [Member] | Foreign Government Obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 5.4 5.4
Short-term Investments [Member] | Municipal Obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 12.1 5.0
Short-term Investments [Member] | Marketable Equity Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 24.6 8.3
Short-term Investments [Member] | Asset-backed Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 81.9 10.8
Short-term Investments [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 457.7 238.8
Other Assets [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 218.0 127.2
Other Long-term Liabilities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other long-term liabilities $ 25.3 $ 15.6
[1] Cash equivalents are included in Cash and cash equivalents in the Consolidated Balance Sheets.
[2] Available-for-sale investments are included in the following accounts in the Consolidated Balance Sheets (in millions): December 31, 2012 December 31, 2011 Short-term investments$457.7 $238.8Other assets218.0 127.2Total$675.7 $366.0
[3] Forward foreign exchange contracts in an asset position are included in Prepaid expenses, taxes and other current assets in the Consolidated Balance Sheets.
[4] Forward foreign exchange contracts in a liability position are included in Other current liabilities in the Consolidated Balance Sheets.
[5] Contingent consideration liability is included in the following accounts in the Consolidated Balance Sheet (in millions): December 31, 2012 December 31, 2011 Other current liabilities$27.3 $8.5Other long-term liabilities25.3 15.6 Total$52.6 $24.1