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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 1,615.5 $ 1,622.6
Total 6,131.6  
Total assets measured at fair value, Amortized Cost 7,716.9 6,829.9
Gross Unrealized Gains 22.8 39.4
Gross Unrealized Losses (4.9) (0.2)
Allowance for Credit Loss 0.0 0.0
Total assets measured at fair value, Fair Value 7,734.8 6,869.1
Short- term Investments 2,823.7 3,488.8
Long- term Investments 3,295.6 1,757.7
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 717.6 644.3
Fair Value 717.6 644.3
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 870.7 838.3
Total 3,389.4 3,252.6
Gross Unrealized Gains 13.5 23.0
Gross Unrealized Losses (2.4) 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 3,400.5 3,275.6
Short- term Investments 962.4 1,567.9
Long- term Investments 1,567.4 869.4
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 867.7 625.8
Fair Value 867.7 625.8
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 3.0 212.5
Total 2,521.7 2,626.8
Gross Unrealized Gains 13.5 23.0
Gross Unrealized Losses (2.4) 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 2,532.8 2,649.8
Short- term Investments 962.4 1,567.9
Long- term Investments 1,567.4 869.4
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 27.2 140.0
Total 3,609.9 2,933.0
Gross Unrealized Gains 9.3 16.4
Gross Unrealized Losses (2.5) (0.2)
Allowance for Credit Loss 0.0 0.0
Fair Value 3,616.7 2,949.2
Short- term Investments 1,861.3 1,920.9
Long- term Investments 1,728.2 888.3
Level 2 | Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 27.2 64.1
Total 749.1 671.3
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 749.1 671.3
Short- term Investments 721.9 607.2
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 2,086.3 1,425.4
Gross Unrealized Gains 6.9 11.9
Gross Unrealized Losses (2.0) (0.2)
Allowance for Credit Loss 0.0 0.0
Fair Value 2,091.2 1,437.1
Short- term Investments 888.6 1,036.5
Long- term Investments 1,202.6 397.2
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 72.5
Total 580.4 716.5
Gross Unrealized Gains 0.9 2.5
Gross Unrealized Losses (0.3) 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 581.0 719.0
Short- term Investments 178.0 233.6
Long- term Investments 403.0 412.9
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 194.1 119.8
Gross Unrealized Gains 1.5 2.0
Gross Unrealized Losses (0.2) 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 195.4 121.8
Short- term Investments 72.8 43.6
Long- term Investments $ 122.6 $ 78.2