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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 1,346.7 $ 1,622.6
Total 6,860.9  
Total assets measured at fair value, Amortized Cost 8,207.6 6,829.9
Gross Unrealized Gains 17.6 39.4
Gross Unrealized Losses (5.5) (0.2)
Allowance for Credit Loss 0.0 0.0
Total assets measured at fair value, Fair Value 8,219.7 6,869.1
Short- term Investments 2,741.5 3,488.8
Long- term Investments 4,131.5 1,757.7
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 534.5 644.3
Fair Value 534.5 644.3
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 812.2 838.3
Total 4,062.9 3,252.6
Gross Unrealized Gains 10.6 23.0
Gross Unrealized Losses (2.8) 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 4,070.7 3,275.6
Short- term Investments 1,104.6 1,567.9
Long- term Investments 2,153.9 869.4
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 812.2 625.8
Fair Value 812.2 625.8
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 0.0 212.5
Total 3,250.7 2,626.8
Gross Unrealized Gains 10.6 23.0
Gross Unrealized Losses (2.8) 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 3,258.5 2,649.8
Short- term Investments 1,104.6 1,567.9
Long- term Investments 2,153.9 869.4
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 140.0
Total 3,610.2 2,933.0
Gross Unrealized Gains 7.0 16.4
Gross Unrealized Losses (2.7) (0.2)
Allowance for Credit Loss 0.0 0.0
Fair Value 3,614.5 2,949.2
Short- term Investments 1,636.9 1,920.9
Long- term Investments 1,977.6 888.3
Level 2 | Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 64.1
Total 632.7 671.3
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 632.7 671.3
Short- term Investments 632.7 607.2
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 2,262.4 1,425.4
Gross Unrealized Gains 5.3 11.9
Gross Unrealized Losses (2.0) (0.2)
Allowance for Credit Loss 0.0 0.0
Fair Value 2,265.7 1,437.1
Short- term Investments 794.4 1,036.5
Long- term Investments 1,471.3 397.2
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 72.5
Total 538.3 716.5
Gross Unrealized Gains 0.5 2.5
Gross Unrealized Losses (0.5) 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 538.3 719.0
Short- term Investments 150.8 233.6
Long- term Investments 387.5 412.9
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 176.8 119.8
Gross Unrealized Gains 1.2 2.0
Gross Unrealized Losses (0.2) 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 177.8 121.8
Short- term Investments 59.0 43.6
Long- term Investments $ 118.8 $ 78.2