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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 1,370.6 $ 1,167.6
Total 5,058.2  
Total assets measured at fair value, Amortized Cost 6,312.4 5,818.1
Gross Unrealized Gains 49.2 27.9
Gross Unrealized Losses (0.2) (0.8)
Allowance for Credit Loss 0.0  
Total assets measured at fair value, Fair Value 6,361.4 5,845.2
Short- term Investments 3,347.6 2,054.1
Long- term Investments 1,643.2 2,623.5
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 508.7 413.1
Fair Value 508.7 413.1
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 854.0 726.8
Total 3,083.0 2,662.6
Gross Unrealized Gains 28.9 9.7
Gross Unrealized Losses 0.0 (0.4)
Allowance for Credit Loss 0.0  
Fair Value 3,111.9 2,671.9
Short- term Investments 1,405.2 890.8
Long- term Investments 852.7 1,054.3
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 745.5 726.8
Fair Value 745.5 726.8
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 108.5 0.0
Total 2,337.5 1,935.8
Gross Unrealized Gains 28.9 9.7
Gross Unrealized Losses 0.0 (0.4)
Allowance for Credit Loss 0.0  
Fair Value 2,366.4 1,945.1
Short- term Investments 1,405.2 890.8
Long- term Investments 852.7 1,054.3
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 7.9 27.7
Total 2,720.7 2,742.4
Gross Unrealized Gains 20.3 18.2
Gross Unrealized Losses (0.2) (0.4)
Allowance for Credit Loss 0.0  
Fair Value 2,740.8 2,760.2
Short- term Investments 1,942.4 1,163.3
Long- term Investments 790.5 1,569.2
Level 2 | Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 5.0 25.5
Total 554.1 165.1
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Allowance for Credit Loss 0.0  
Fair Value 554.1 165.1
Short- term Investments 549.1 139.6
Long- term Investments 0.0 0.0
Level 2 | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 2.9 0.0
Total 1,514.8 2,096.1
Gross Unrealized Gains 15.1 16.8
Gross Unrealized Losses (0.2) (0.2)
Allowance for Credit Loss 0.0  
Fair Value 1,529.7 2,112.7
Short- term Investments 1,135.0 798.5
Long- term Investments 391.8 1,314.2
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 550.2 418.3
Gross Unrealized Gains 3.0 1.1
Gross Unrealized Losses 0.0 (0.2)
Allowance for Credit Loss 0.0  
Fair Value 553.2 419.2
Short- term Investments 228.0 209.6
Long- term Investments 325.2 209.6
Level 2 | Non-U.S. government securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 9.5 4.5
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Allowance for Credit Loss 0.0  
Fair Value 9.5 4.5
Short- term Investments 4.5 4.5
Long- term Investments 5.0 0.0
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 2.2
Total 92.1 58.4
Gross Unrealized Gains 2.2 0.3
Gross Unrealized Losses 0.0 0.0
Allowance for Credit Loss 0.0  
Fair Value 94.3 58.7
Short- term Investments 25.8 11.1
Long- term Investments $ 68.5 $ 45.4