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Financial Instruments and Fair Value , Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 1,637.3 $ 892.8
Unrealized Gains 0.0 1.0
Unrealized Losses (2.5) 0.0
Fair Value 1,634.8 893.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 1,215.0 240.4
Less Than 12 Months, Unrealized Losses (2.5) 0.0
12 Months or Greater, Fair Value 0.0 0.0
12 Months or Greater, Unrealized Losses 0.0 0.0
Total, Fair Value 1,215.0 240.4
Total, Unrealized Losses (2.5) 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Due within one year 1,194.0 775.5
Due within one to three years 440.8 118.3
Fair Value 1,634.8 893.8
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 566.0 185.4
Unrealized Gains 0.0 0.0
Unrealized Losses (0.2) 0.0
Fair Value 565.8 185.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 288.0 61.5
Less Than 12 Months, Unrealized Losses (0.2) 0.0
12 Months or Greater, Fair Value 0.0 0.0
12 Months or Greater, Unrealized Losses 0.0 0.0
Total, Fair Value 288.0 61.5
Total, Unrealized Losses (0.2) 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value 565.8 185.4
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 540.7 410.5
Unrealized Gains 0.0 1.0
Unrealized Losses (1.2) 0.0
Fair Value 539.5 411.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 494.4 111.3
Less Than 12 Months, Unrealized Losses (1.2) 0.0
12 Months or Greater, Fair Value 0.0 0.0
12 Months or Greater, Unrealized Losses 0.0 0.0
Total, Fair Value 494.4 111.3
Total, Unrealized Losses (1.2) 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value 539.5 411.5
U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 356.1 184.9
Unrealized Gains 0.0 0.0
Unrealized Losses (1.0) 0.0
Fair Value 355.1 184.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 334.2 38.1
Less Than 12 Months, Unrealized Losses (1.0) 0.0
12 Months or Greater, Fair Value 0.0 0.0
12 Months or Greater, Unrealized Losses 0.0 0.0
Total, Fair Value 334.2 38.1
Total, Unrealized Losses (1.0) 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value 355.1 184.9
Certificates of deposit and term deposits    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 169.1 112.0
Unrealized Gains 0.0 0.0
Unrealized Losses (0.1) 0.0
Fair Value 169.0 112.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 93.1 29.5
Less Than 12 Months, Unrealized Losses (0.1) 0.0
12 Months or Greater, Fair Value 0.0 0.0
12 Months or Greater, Unrealized Losses 0.0 0.0
Total, Fair Value 93.1 29.5
Total, Unrealized Losses (0.1) 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value 169.0 $ 112.0
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 5.4  
Unrealized Gains 0.0  
Unrealized Losses 0.0  
Fair Value 5.4  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 5.3  
Less Than 12 Months, Unrealized Losses 0.0  
12 Months or Greater, Fair Value 0.0  
12 Months or Greater, Unrealized Losses 0.0  
Total, Fair Value 5.3  
Total, Unrealized Losses 0.0  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value $ 5.4