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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 1,401.8 $ 1,622.6
Total 5,822.4  
Total assets measured at fair value, Amortized Cost 7,204.7 6,829.9
Gross Unrealized Gains 29.9 39.4
Gross Unrealized Losses (4.1) (0.2)
Allowance for Credit Loss 0.0 0.0
Total assets measured at fair value, Fair Value 7,230.5 6,869.1
Short- term Investments 3,155.7 3,488.8
Long- term Investments 2,673.0 1,757.7
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 565.1 644.3
Fair Value 565.1 644.3
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 821.2 838.3
Total 3,495.4 3,252.6
Gross Unrealized Gains 17.7 23.0
Gross Unrealized Losses (1.8) 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 3,511.3 3,275.6
Short- term Investments 1,245.8 1,567.9
Long- term Investments 1,444.3 869.4
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 817.2 625.8
Fair Value 817.2 625.8
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 4.0 212.5
Total 2,678.2 2,626.8
Gross Unrealized Gains 17.7 23.0
Gross Unrealized Losses (1.8) 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 2,694.1 2,649.8
Short- term Investments 1,245.8 1,567.9
Long- term Investments 1,444.3 869.4
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 15.5 140.0
Total 3,144.2 2,933.0
Gross Unrealized Gains 12.2 16.4
Gross Unrealized Losses (2.3) (0.2)
Allowance for Credit Loss 0.0 0.0
Fair Value 3,154.1 2,949.2
Short- term Investments 1,909.9 1,920.9
Long- term Investments 1,228.7 888.3
Level 2 | Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 15.5 64.1
Total 643.0 671.3
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 643.0 671.3
Short- term Investments 627.5 607.2
Long- term Investments 0.0 0.0
Level 2 | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 3.4
Total 1,640.2 1,425.4
Gross Unrealized Gains 8.9 11.9
Gross Unrealized Losses (1.8) (0.2)
Allowance for Credit Loss 0.0 0.0
Fair Value 1,647.3 1,437.1
Short- term Investments 966.7 1,036.5
Long- term Investments 680.6 397.2
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 72.5
Total 676.5 716.5
Gross Unrealized Gains 1.6 2.5
Gross Unrealized Losses (0.3) 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 677.8 719.0
Short- term Investments 254.6 233.6
Long- term Investments 423.2 412.9
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 184.5 119.8
Gross Unrealized Gains 1.7 2.0
Gross Unrealized Losses (0.2) 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 186.0 121.8
Short- term Investments 61.1 43.6
Long- term Investments $ 124.9 $ 78.2