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Marketable Securities and Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2025
Fair Value Disclosures [Abstract]  
Schedule of Available-for-Sale Marketable Securities
The following is a summary of the Company’s available-for-sale marketable securities measured at fair value on a recurring basis.
June 30, 2025
(dollars in millions)
Valuation
Hierarchy
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Value
Corporate bondsLevel 2$685.6 $1.3 $(0.3)$686.6 
Government securitiesLevel 259.7 — — 59.7 
Total$745.3 $1.3 $(0.3)$746.3 
 December 31, 2024
(dollars in millions)
Valuation
Hierarchy
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Value
Corporate bondsLevel 2$934.4 $1.7 $(0.7)$935.4 
Government securitiesLevel 23.5 — — 3.5 
Total$937.9 $1.7 $(0.7)$938.9