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3. Fair Value Measurements Fair Value Level Table (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure $ 621.4 $ 366.0
Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 6.4 [1] 79.9 [1]
Available-for-sale Securities, Fair Value Disclosure 217.2 [2] 134.8 [2]
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure 0 [3] 0 [3]
Assets, Fair Value Disclosure 223.6 214.7
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure 0 [4] 0 [4]
Business Acquisition, Contingent Consideration, at Fair Value 0 [5] 0 [5]
Liabilities, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 81.7 [1] 114.6 [1]
Available-for-sale Securities, Fair Value Disclosure 404.2 [2] 231.2 [2]
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure 0.3 [3] 0.8 [3]
Assets, Fair Value Disclosure 486.2 346.6
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure 0.5 [4] 1.2 [4]
Business Acquisition, Contingent Consideration, at Fair Value 0 [5] 0 [5]
Liabilities, Fair Value Disclosure 0.5 1.2
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 Securities, Fair Value Disclosure 0 [2] 0 [2]
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure 0 [3] 0 [3]
Assets, Fair Value Disclosure 0 0
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure 0 [4] 0 [4]
Business Acquisition, Contingent Consideration, at Fair Value 52.7 [5] 24.1 [5]
Liabilities, Fair Value Disclosure 52.7 24.1
Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 88.1 [1] 194.5 [1]
Available-for-sale Securities, Fair Value Disclosure 621.4 [2] 366.0 [2]
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure 0.3 [3] 0.8 [3]
Assets, Fair Value Disclosure 709.8 561.3
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure 0.5 [4] 1.2 [4]
Business Acquisition, Contingent Consideration, at Fair Value 52.7 [5] 24.1 [5]
Liabilities, Fair Value Disclosure 53.2 25.3
US Government and Government Agencies and Authorities Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 0 [1]  
US Government and Government Agencies and Authorities Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 9.2 [1]  
US Government and Government Agencies and Authorities Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 0 [1]  
US Government and Government Agencies and Authorities Debt Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 9.2 [1]  
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 0 [1] 0 [1]
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 71.8 [1] 106.0 [1]
Commercial Paper [Member] | 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]
Commercial Paper [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 71.8 [1] 106.0 [1]
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 0 [1] 0 [1]
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 0.7 [1] 8.6 [1]
Corporate Bond Securities [Member] | 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]
Corporate Bond Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 0.7 [1] 8.6 [1]
Time Deposits [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents   21.6 [1]
Time Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents   0 [1]
Time Deposits [Member] | Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents   0 [1]
Time Deposits [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents   21.6 [1]
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 6.4 [1] 58.3 [1]
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 0 [1] 0 [1]
Money Market Funds [Member] | 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]
Money Market Funds [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 6.4 [1] 58.3 [1]
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [2] 0 [2]
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 208.5 [2] 170.6 [2]
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [2] 0 [2]
Corporate Debt Securities [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 Securities, Fair Value Disclosure 208.5 [2] 170.6 [2]
Brokered Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure   0 [2]
Brokered Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure   1.8 [2]
Brokered Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure   0 [2]
Brokered Certificates of Deposit [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 Securities, Fair Value Disclosure   1.8 [2]
US Government and Government Agencies and Authorities Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [2] 0 [2]
US Government and Government Agencies and Authorities Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 98.3 [2] 36.9 [2]
US Government and Government Agencies and Authorities Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [2] 0 [2]
US Government and Government Agencies and Authorities Debt Securities [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 Securities, Fair Value Disclosure 98.3 [2] 36.9 [2]
Foreign Government Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [2] 0 [2]
Foreign Government Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 3.6 [2] 5.7 [2]
Foreign Government Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [2] 0 [2]
Foreign Government Obligations [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 Securities, Fair Value Disclosure 3.6 [2] 5.7 [2]
Municipal obligations [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [2] 0 [2]
Municipal obligations [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 10.2 [2] 5.0 [2]
Municipal obligations [Member] | Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [2] 0 [2]
Municipal obligations [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 Securities, Fair Value Disclosure 10.2 [2] 5.0 [2]
Marketable Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 217.2 [2] 134.8 [2]
Marketable Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [2] 0 [2]
Marketable Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [2] 0 [2]
Marketable Equity Securities [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 Securities, Fair Value Disclosure 217.2 [2] 134.8 [2]
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [2] 0 [2]
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 83.6 [2] 11.2 [2]
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [2] 0 [2]
Asset-backed Securities [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 Securities, Fair Value Disclosure 83.6 [2] 11.2 [2]
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]    
Business Acquisition, Contingent Consideration, at Fair Value, Current 26.7 8.5
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 Securities, Fair Value Disclosure 427.2 238.8
Short-term Investments [Member] | Corporate Debt Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 208.5 170.6
Short-term Investments [Member] | Brokered Certificates of Deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure   1.8
Short-term Investments [Member] | US Government and Government Agencies and Authorities Debt Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 98.3 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 Securities, Fair Value Disclosure 3.4 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 Securities, Fair Value Disclosure 10.2 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 Securities, Fair Value Disclosure 23.6 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 Securities, Fair Value Disclosure 83.2 10.8
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 Securities, Fair Value Disclosure 194.2 127.2
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]    
Business Acquisition, Contingent Consideration, at Fair Value, Noncurrent $ 26.0 $ 15.6
[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, 2012 December 31, 2011Short-term investments$427.2 $238.8Other assets194.2 127.2Total$621.4 $366.0
[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.
[5] Contingent consideration liability is included in the following accounts in the Condensed Consolidated Balance Sheet (in millions): September 30, 2012 December 31, 2011Other current liabilities$26.7 $8.5Other long-term liabilities26.0 15.6 Total$52.7 $24.1