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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 1,538.0 $ 1,290.9
Total 6,083.8  
Gross Unrealized Gains 0.0 9.9
Gross Unrealized Losses (228.7) (31.2)
Allowance for Credit Loss (1.1) 0.0
Fair Value 5,854.0  
Short- term Investments 2,775.9 2,913.1
Long- term Investments 3,078.1 4,415.5
Total assets measured at fair value, amortized cost 7,621.8 8,640.8
Total assets measured at fair value, fair value 7,392.0 8,619.5
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 536.3 572.3
Fair Value 536.3 572.3
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 1,001.7 713.6
Total 4,050.5 4,125.7
Gross Unrealized Gains 0.0 6.3
Gross Unrealized Losses (113.0) (15.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 3,937.5 4,116.6
Short- term Investments 1,545.4 1,100.3
Long- term Investments 1,390.4 2,302.7
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 1,001.7 696.6
Fair Value 1,001.7 696.6
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 17.0
Total 3,048.8 3,429.1
Gross Unrealized Gains 0.0 6.3
Gross Unrealized Losses (113.0) (15.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 2,935.8 3,420.0
Short- term Investments 1,545.4 1,100.3
Long- term Investments 1,390.4 2,302.7
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 5.0
Total 3,035.0 3,942.8
Gross Unrealized Gains 0.0 3.6
Gross Unrealized Losses (115.7) (15.8)
Allowance for Credit Loss (1.1) 0.0
Fair Value 2,918.2 3,930.6
Short- term Investments 1,230.5 1,812.8
Long- term Investments 1,687.7 2,112.8
Level 2 | Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 104.2 717.7
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 104.2 717.7
Short- term Investments 104.2 717.7
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 5.0
Total 2,256.1 2,485.6
Gross Unrealized Gains 0.0 2.7
Gross Unrealized Losses (87.2) (11.9)
Allowance for Credit Loss (1.1) 0.0
Fair Value 2,167.8 2,476.4
Short- term Investments 843.9 886.7
Long- term Investments 1,323.9 1,584.7
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 499.3 526.1
Gross Unrealized Gains 0.0 0.2
Gross Unrealized Losses (21.8) (2.9)
Allowance for Credit Loss 0.0 0.0
Fair Value 477.5 523.4
Short- term Investments 209.5 137.8
Long- term Investments 268.0 385.6
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 175.4 213.4
Gross Unrealized Gains 0.0 0.7
Gross Unrealized Losses (6.7) (1.0)
Allowance for Credit Loss 0.0 0.0
Fair Value 168.7 213.1
Short- term Investments 72.9 70.6
Long- term Investments $ 95.8 $ 142.5