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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 1,103.1 $ 1,290.9
Total 7,473.6  
Gross Unrealized Gains 1.3 9.9
Gross Unrealized Losses (143.0) (31.2)
Allowance for Credit Loss (1.1) 0.0
Fair Value 7,330.8  
Short- term Investments 2,882.5 2,913.1
Long- term Investments 4,416.2 4,415.5
Total assets measured at fair value, amortized cost 8,544.6 8,640.8
Total assets measured at fair value, fair value 8,401.8 8,619.5
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 579.4 572.3
Fair Value 579.4 572.3
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 503.6 713.6
Total 4,091.1 4,125.7
Gross Unrealized Gains 0.9 6.3
Gross Unrealized Losses (71.8) (15.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 4,020.2 4,116.6
Short- term Investments 1,329.3 1,100.3
Long- term Investments 2,187.3 2,302.7
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 491.6 696.6
Fair Value 491.6 696.6
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 12.0 17.0
Total 3,599.5 3,429.1
Gross Unrealized Gains 0.9 6.3
Gross Unrealized Losses (71.8) (15.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 3,528.6 3,420.0
Short- term Investments 1,329.3 1,100.3
Long- term Investments 2,187.3 2,302.7
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 20.1 5.0
Total 3,874.1 3,942.8
Gross Unrealized Gains 0.4 3.6
Gross Unrealized Losses (71.2) (15.8)
Allowance for Credit Loss (1.1) 0.0
Fair Value 3,802.2 3,930.6
Short- term Investments 1,553.2 1,812.8
Long- term Investments 2,228.9 2,112.8
Level 2 | Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 16.2 0.0
Total 581.3 717.7
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Allowance for Credit Loss 0.0 0.0
Fair Value 581.3 717.7
Short- term Investments 565.1 717.7
Long- term Investments 0.0 0.0
Level 2 | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 3.9 5.0
Total 2,554.6 2,485.6
Gross Unrealized Gains 0.3 2.7
Gross Unrealized Losses (53.3) (11.9)
Allowance for Credit Loss (1.1) 0.0
Fair Value 2,500.5 2,476.4
Short- term Investments 770.0 886.7
Long- term Investments 1,726.6 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 541.3 526.1
Gross Unrealized Gains 0.0 0.2
Gross Unrealized Losses (13.5) (2.9)
Allowance for Credit Loss 0.0 0.0
Fair Value 527.8 523.4
Short- term Investments 140.0 137.8
Long- term Investments 387.8 385.6
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 196.9 213.4
Gross Unrealized Gains 0.1 0.7
Gross Unrealized Losses (4.4) (1.0)
Allowance for Credit Loss 0.0 0.0
Fair Value 192.6 213.1
Short- term Investments 78.1 70.6
Long- term Investments $ 114.5 $ 142.5