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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Cash and Cash Equivalents $ 1,536.1 $ 1,290.9
Total 6,821.0  
Gross Unrealized Gains 0.1 9.9
Gross Unrealized Losses (180.7) (31.2)
Allowance for Credit Loss (1.1) 0.0
Fair Value 6,639.3  
Short- term Investments 2,901.3 2,913.1
Long- term Investments 3,738.0 4,415.5
Total assets measured at fair value, amortized cost 8,357.1 8,640.8
Total assets measured at fair value, fair value 8,175.4 8,619.5
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and Cash Equivalents 532.7 572.3
Fair Value 532.7 572.3
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and Cash Equivalents 1,003.4 713.6
Total 4,333.5 4,125.7
Gross Unrealized Gains 0.0 6.3
Gross Unrealized Losses (89.6) (15.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 4,243.9 4,116.6
Short- term Investments 1,447.1 1,100.3
Long- term Investments 1,793.4 2,302.7
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and Cash Equivalents 1,003.4 696.6
Fair Value 1,003.4 696.6
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 3,330.1 3,429.1
Gross Unrealized Gains 0.0 6.3
Gross Unrealized Losses (89.6) (15.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 3,240.5 3,420.0
Short- term Investments 1,447.1 1,100.3
Long- term Investments 1,793.4 2,302.7
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and Cash Equivalents 0.0 5.0
Total 3,490.9 3,942.8
Gross Unrealized Gains 0.1 3.6
Gross Unrealized Losses (91.1) (15.8)
Allowance for Credit Loss (1.1) 0.0
Fair Value 3,398.8 3,930.6
Short- term Investments 1,454.2 1,812.8
Long- term Investments 1,944.6 2,112.8
Level 2 | Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Cash and Cash Equivalents 0.0 0.0
Total 310.6 717.7
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 310.6 717.7
Short- term Investments 310.6 717.7
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 2,472.2 2,485.6
Gross Unrealized Gains 0.0 2.7
Gross Unrealized Losses (69.1) (11.9)
Allowance for Credit Loss (1.1) 0.0
Fair Value 2,402.0 2,476.4
Short- term Investments 927.5 886.7
Long- term Investments 1,474.5 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 522.9 526.1
Gross Unrealized Gains 0.1 0.2
Gross Unrealized Losses (16.7) (2.9)
Allowance for Credit Loss 0.0 0.0
Fair Value 506.3 523.4
Short- term Investments 149.9 137.8
Long- term Investments 356.4 385.6
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and Cash Equivalents 0.0 0.0
Total 185.2 213.4
Gross Unrealized Gains 0.0 0.7
Gross Unrealized Losses (5.3) (1.0)
Allowance for Credit Loss 0.0 0.0
Fair Value 179.9 213.1
Short- term Investments 66.2 70.6
Long- term Investments $ 113.7 $ 142.5