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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 2,035.6 $ 1,167.6
Total 4,188.3  
Total assets measured at fair value, Amortized Cost 6,017.7 5,818.1
Gross Unrealized Gains 58.7 27.9
Gross Unrealized Losses (0.3) (0.8)
Allowance for Credit Loss 1.3  
Total assets measured at fair value, Fair Value 6,074.8 5,845.2
Short- term Investments 2,452.7 2,054.1
Long- term Investments 1,586.5 2,623.5
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 562.6 413.1
Fair Value 562.6 413.1
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 1,389.3 726.8
Total 3,264.2 2,662.6
Gross Unrealized Gains 35.0 9.7
Gross Unrealized Losses 0.0 (0.4)
Allowance for Credit Loss 0.0  
Fair Value 3,299.2 2,671.9
Short- term Investments 1,023.1 890.8
Long- term Investments 886.8 1,054.3
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 1,266.8 726.8
Fair Value 1,266.8 726.8
Short- term Investments 0.0 0.0
Long- term Investments 0.0 0.0
Level 1 | U.S. treasuries    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 122.5 0.0
Total 1,997.4 1,935.8
Gross Unrealized Gains 35.0 9.7
Gross Unrealized Losses 0.0 (0.4)
Allowance for Credit Loss 0.0  
Fair Value 2,032.4 1,945.1
Short- term Investments 1,023.1 890.8
Long- term Investments 886.8 1,054.3
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 83.7 27.7
Total 2,190.9 2,742.4
Gross Unrealized Gains 23.7 18.2
Gross Unrealized Losses (0.3) (0.4)
Allowance for Credit Loss 1.3  
Fair Value 2,213.0 2,760.2
Short- term Investments 1,429.6 1,163.3
Long- term Investments 699.7 1,569.2
Level 2 | Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 26.6 25.5
Total 269.7 165.1
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Allowance for Credit Loss 0.0  
Fair Value 269.7 165.1
Short- term Investments 243.1 139.6
Long- term Investments 0.0 0.0
Level 2 | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 7.1 0.0
Total 1,436.2 2,096.1
Gross Unrealized Gains 18.0 16.8
Gross Unrealized Losses (0.3) (0.2)
Allowance for Credit Loss 1.3  
Fair Value 1,452.6 2,112.7
Short- term Investments 972.3 798.5
Long- term Investments 473.2 1,314.2
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 50.0 0.0
Total 410.7 418.3
Gross Unrealized Gains 3.6 1.1
Gross Unrealized Losses 0.0 (0.2)
Allowance for Credit Loss 0.0  
Fair Value 414.3 419.2
Short- term Investments 202.4 209.6
Long- term Investments 161.9 209.6
Level 2 | Non-U.S. government securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 4.5 4.5
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Allowance for Credit Loss 0.0  
Fair Value 4.5 4.5
Short- term Investments 4.5 4.5
Long- term Investments 0.0 0.0
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 2.2
Total 69.8 58.4
Gross Unrealized Gains 2.1 0.3
Gross Unrealized Losses 0.0 0.0
Allowance for Credit Loss 0.0  
Fair Value 71.9 58.7
Short- term Investments 7.3 11.1
Long- term Investments $ 64.6 $ 45.4