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Financial Instruments and Fair Value - Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 1,317.8 $ 1,126.0
Unrealized Gains 1.1 0.7
Unrealized Losses (0.2) (0.3)
Fair Value 1,318.7 1,126.4
Marketable equity securities 98.1 64.2
Fair Value 1,416.8 1,190.6
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 1,318.7 251.6
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 1,318.7 251.6
Total, Unrealized Losses (0.2) (0.3)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Due within one year 1,029.6 1,126.4
Due within one to three years 289.1 0.0
Fair Value 1,318.7 1,126.4
U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 560.0 469.1
Unrealized Gains 0.6 0.4
Unrealized Losses (0.1) 0.0
Fair Value 560.5 469.5
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 560.5 27.8
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 560.5 27.8
Total, Unrealized Losses (0.1) 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value 560.5 469.5
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 370.4 428.7
Unrealized Gains 0.1 0.2
Unrealized Losses 0.0 (0.2)
Fair Value 370.5 428.7
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 370.5 149.4
Less Than 12 Months, Unrealized Losses 0.0 (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 370.5 149.4
Total, Unrealized Losses 0.0 (0.2)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value 370.5 428.7
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 285.2 166.4
Unrealized Gains 0.3 0.1
Unrealized Losses (0.1) (0.1)
Fair Value 285.4 166.4
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 285.4 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 285.4 63.5
Total, Unrealized Losses (0.1) (0.1)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value 285.4 166.4
Certificates of deposit and term deposits    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 102.2 61.8
Unrealized Gains 0.1 0.0
Unrealized Losses 0.0 0.0
Fair Value 102.3 61.8
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 102.3 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 102.3 10.9
Total, Unrealized Losses 0.0 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value $ 102.3 $ 61.8