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3. Fair Value Measurements Fair Value Level Table (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure $ 730.6 $ 675.7
Fair Value, Inputs, Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 14.8 [1] 15.6 [1]
Available-for-sale Securities, Fair Value Disclosure 290.6 [2] 242.1 [2]
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure 0 [3] 0 [3]
Assets, Fair Value Disclosure 305.4 257.7
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure 0 [4] 0 [4]
Liabilities, Fair Value Disclosure 0 0
Contingent Consideration at Fair Value 0 [5] 0 [5]
Fair Value, Inputs, Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 48.4 [1] 54.1 [1]
Available-for-sale Securities, Fair Value Disclosure 440.0 [2] 433.6 [2]
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure 1.3 [3] 1.1 [3]
Assets, Fair Value Disclosure 489.7 488.8
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure 1.2 [4] 0.8 [4]
Liabilities, Fair Value Disclosure 1.2 0.8
Contingent Consideration at Fair Value 0 [5] 0 [5]
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]
Liabilities, Fair Value Disclosure 37.8 52.6
Contingent Consideration at Fair Value 37.8 [5] 52.6 [5]
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 63.2 [1] 69.7 [1]
Available-for-sale Securities, Fair Value Disclosure 730.6 [2] 675.7 [2]
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure 1.3 [3] 1.1 [3]
Assets, Fair Value Disclosure 795.1 746.5
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure 1.2 [4] 0.8 [4]
Liabilities, Fair Value Disclosure 39.0 53.4
Contingent Consideration at Fair Value 37.8 [5] 52.6 [5]
US Government Sponsored Agencies [Member] | Fair Value, Inputs, Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents   1.3 [1]
US Government Sponsored Agencies [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 Sponsored Agencies [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents   1.3 [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 43.9 [1] 52.8 [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 43.9 [1] 52.8 [1]
Foreign Government Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 0 [1]  
Foreign Government Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 4.5 [1]  
Foreign Government Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 0 [1]  
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]    
Cash Equivalents 4.5 [1]  
Foreign Time Deposits [Member] | Fair Value, Inputs, Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 10.0 [1] 10.1 [1]
Foreign 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] 0 [1]
Foreign 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] 0 [1]
Foreign 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 10.0 [1] 10.1 [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 4.8 [1] 5.5 [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 4.8 [1] 5.5 [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 236.7 [2] 240.6 [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 236.7 [2] 240.6 [2]
Foreign 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] 0 [2]
Foreign 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 9.3 [2] 0.4 [2]
Foreign 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] 0 [2]
Foreign 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 9.3 [2] 0.4 [2]
US Government Sponsored Agencies [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 Sponsored Agencies [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 84.2 [2] 92.7 [2]
US Government Sponsored Agencies [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 Sponsored Agencies [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 84.2 [2] 92.7 [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 9.5 [2] 5.6 [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 9.5 [2] 5.6 [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 14.3 [2] 12.1 [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 14.3 [2] 12.1 [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 290.6 [2] 242.1 [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 290.6 [2] 242.1 [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 86.0 [2] 82.2 [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 86.0 [2] 82.2 [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]    
Contingent Consideration at Fair Value 13.1 27.3
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 467.4 457.7
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 236.7 240.6
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 Securities, Fair Value Disclosure 9.3 0.4
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 Securities, Fair Value Disclosure 84.2 92.7
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 9.5 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 14.3 12.1
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 27.7 24.6
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 85.7 81.9
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 263.2 218.0
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]    
Contingent Consideration at Fair Value $ 24.7 $ 25.3
[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): June 30, 2013 December 31, 2012Short-term investments$467.4 $457.7Other assets263.2 218.0Total$730.6 $675.7
[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 Sheets (in millions): June 30, 2013 December 31, 2012Other current liabilities$13.1 $27.3Other long-term liabilities24.7 25.3 Total$37.8 $52.6