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Financial Instruments and Fair Value - Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 1,151.4 $ 1,126.0
Unrealized Gains 0.3 0.7
Unrealized Losses (0.2) (0.3)
Fair Value 1,151.5 1,126.4
Marketable equity securities 67.6 64.2
Fair Value 1,219.1 1,190.6
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 473.5 251.6
Less Than 12 Months, Unrealized Losses (0.2) (0.3)
12 Months or Greater, Fair Value 0.0 0.0
12 Months or Greater, Unrealized Losses 0.0 0.0
Total, Fair Value 473.5 251.6
Total, Unrealized Losses (0.2) (0.3)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Due within one year 1,116.3 1,126.4
Due within one to three years 35.2 0.0
Fair Value 1,151.5 1,126.4
U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 486.5 469.1
Unrealized Gains 0.2 0.4
Unrealized Losses 0.0 0.0
Fair Value 486.7 469.5
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 119.7 27.8
Less Than 12 Months, Unrealized Losses 0.0 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 119.7 27.8
Total, Unrealized Losses 0.0 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value 486.7 469.5
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 432.8 428.7
Unrealized Gains 0.1 0.2
Unrealized Losses (0.1) (0.2)
Fair Value 432.8 428.7
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 260.5 149.4
Less Than 12 Months, Unrealized Losses (0.1) (0.2)
12 Months or Greater, Fair Value 0.0 0.0
12 Months or Greater, Unrealized Losses 0.0 0.0
Total, Fair Value 260.5 149.4
Total, Unrealized Losses (0.1) (0.2)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value 432.8 428.7
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 158.2 166.4
Unrealized Gains 0.0 0.1
Unrealized Losses (0.1) (0.1)
Fair Value 158.1 166.4
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 83.8 63.5
Less Than 12 Months, Unrealized Losses (0.1) (0.1)
12 Months or Greater, Fair Value 0.0 0.0
12 Months or Greater, Unrealized Losses 0.0 0.0
Total, Fair Value 83.8 63.5
Total, Unrealized Losses (0.1) (0.1)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value 158.1 166.4
Certificates of deposit and term deposits    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 73.9 61.8
Unrealized Gains 0.0 0.0
Unrealized Losses 0.0 0.0
Fair Value 73.9 61.8
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 9.5 10.9
Less Than 12 Months, Unrealized Losses 0.0 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 9.5 10.9
Total, Unrealized Losses 0.0 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value $ 73.9 $ 61.8