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Financial Instruments and Fair Value - Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 1,222.6 $ 1,126.0
Unrealized Gains 0.1 0.7
Unrealized Losses (0.3) (0.3)
Fair Value 1,222.4 1,126.4
Marketable equity securities 84.0 64.2
Fair Value 1,306.4 1,190.6
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 887.2 251.6
Less Than 12 Months, Unrealized Losses (0.3) (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 887.2 251.6
Total, Unrealized Losses (0.3) (0.3)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Due within one year 1,110.4 1,126.4
Due within one to three years 112.0 0.0
Fair Value 1,222.4 1,126.4
U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 514.5 469.1
Unrealized Gains 0.1 0.4
Unrealized Losses (0.1) 0.0
Fair Value 514.5 469.5
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 393.7 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 393.7 27.8
Total, Unrealized Losses (0.1) 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value 514.5 469.5
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 433.2 428.7
Unrealized Gains 0.0 0.2
Unrealized Losses (0.1) (0.2)
Fair Value 433.1 428.7
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 355.1 149.4
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 355.1 149.4
Total, Unrealized Losses (0.1) (0.2)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value 433.1 428.7
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 177.6 166.4
Unrealized Gains 0.0 0.1
Unrealized Losses (0.1) (0.1)
Fair Value 177.5 166.4
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 119.1 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 119.1 63.5
Total, Unrealized Losses (0.1) (0.1)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value 177.5 166.4
Certificates of deposit and term deposits    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 97.3 61.8
Unrealized Gains 0.0 0.0
Unrealized Losses 0.0 0.0
Fair Value 97.3 61.8
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less Than 12 Months, Fair Value 19.3 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 19.3 10.9
Total, Unrealized Losses 0.0 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fair Value $ 97.3 $ 61.8