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3. Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted Investments, at Fair Value $ 4.2  
Available-for-sale investments [1] 957.6 $ 585.9
Forward foreign exchange contracts, Asset [2] 0.9 0.6
Financial Assets Carried at Fair Value 1,034.3 609.2
Forward foreign exchange contracts, Liability [3] 1.1 1.7
Business Combination, Contingent Consideration, Liability [4] 19.1 27.7
Liabilities, Fair Value Disclosure 20.2 29.4
Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments [1] 156.9 139.9
Foreign Brokered Certificates of Deposit [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments [1]   5.2
US Government Sponsored Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments [1] 74.8 47.5
Foreign Government Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments [1] 4.6 4.0
Municipal Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments [1] 6.4 6.5
Marketable Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments [1] 660.1 334.4
Asset-backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments [1] 54.8 48.4
Foreign Government Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 0.6  
Foreign Time Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 11.9 16.5
US Government Sponsored Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 14.6  
Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 11.3 2.2
Commercial Paper [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 33.2 4.0
Cash Equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 71.6 22.7
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted Investments, at Fair Value 4.2  
Available-for-sale investments [1] 660.1 334.4
Forward foreign exchange contracts, Asset [2] 0.0 0.0
Financial Assets Carried at Fair Value 687.5 353.1
Forward foreign exchange contracts, Liability [3] 0.0 0.0
Business Combination, Contingent Consideration, Liability [4] 0.0 0.0
Liabilities, Fair Value Disclosure 0.0 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 [1] 0.0 0.0
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 [1]   0.0
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 [1] 0.0 0.0
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 [1] 0.0 0.0
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 [1] 0.0 0.0
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 [1] 660.1 334.4
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 [1] 0.0 0.0
Fair Value, Inputs, Level 1 [Member] | Foreign Government Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 0.0  
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 [5] 11.9 16.5
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 [5] 0.0  
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] 11.3 2.2
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 0.0 0.0
Fair Value, Inputs, Level 1 [Member] | Cash Equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 23.2 18.7
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted Investments, at Fair Value 0.0  
Available-for-sale investments [1] 297.5 251.5
Forward foreign exchange contracts, Asset [2] 0.9 0.6
Financial Assets Carried at Fair Value 346.8 256.1
Forward foreign exchange contracts, Liability [3] 1.1 1.7
Business Combination, Contingent Consideration, Liability [4] 0.0 0.0
Liabilities, Fair Value Disclosure 1.1 1.7
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 [1] 156.9 139.9
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 [1]   5.2
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 [1] 74.8 47.5
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 [1] 4.6 4.0
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 [1] 6.4 6.5
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 [1] 0.0 0.0
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 [1] 54.8 48.4
Fair Value, Inputs, Level 2 [Member] | Foreign Government Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 0.6  
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 [5] 0.0 0.0
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 [5] 14.6  
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 [5] 0.0 0.0
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 33.2 4.0
Fair Value, Inputs, Level 2 [Member] | Cash Equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 48.4 4.0
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted Investments, at Fair Value 0.0  
Available-for-sale investments [1] 0.0 0.0
Forward foreign exchange contracts, Asset [2] 0.0 0.0
Financial Assets Carried at Fair Value 0.0 0.0
Forward foreign exchange contracts, Liability [3] 0.0 0.0
Business Combination, Contingent Consideration, Liability [4] 19.1 27.7
Liabilities, Fair Value Disclosure 19.1 27.7
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 [1] 0.0 0.0
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 [1]   0.0
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 [1] 0.0 0.0
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 [1] 0.0 0.0
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 [1] 0.0 0.0
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 [1] 0.0 0.0
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 [1] 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Foreign Government Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 0.0  
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 [5] 0.0 0.0
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 [5] 0.0  
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 [5] 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Cash Equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 0.0 0.0
Other Current Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Business Combination, Contingent Consideration, Liability 13.5 13.1
Short-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 328.7 284.4
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 156.9 139.9
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   5.2
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 74.8 47.5
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 4.6 4.0
Short-term Investments [Member] | Municipal Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 6.4 6.5
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 31.4 33.3
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 54.6 48.0
Other Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 628.9 301.5
Other Noncurrent Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Business Combination, Contingent Consideration, Liability $ 5.6 $ 14.6
[1] Available-for-sale investments are included in the following accounts in the Consolidated Balance Sheets (in millions): December 31, 2015 December 31, 2014 Short-term investments$328.7 $284.4Other investments628.9 301.5Total$957.6 $585.9
[2] Forward foreign exchange contracts in an asset position are included in Other current assets in the Consolidated Balance Sheets.
[3] Forward foreign exchange contracts in a liability position are included in Other current liabilities in the Consolidated Balance Sheets.
[4] Contingent consideration liabilities are included in the following accounts in the Consolidated Balance Sheets (in millions): December 31, 2015 December 31, 2014 Other current liabilities$13.5 $13.1Other long-term liabilities5.6 14.6 Total$19.1 $27.7
[5] Cash equivalents are included in Cash and cash equivalents in the Consolidated Balance Sheets.