Marketable Securities and Fair Value Measurements (Tables)

9 Months Ended

Sep. 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.

	September 30, 2025
(dollars in millions)	Valuation Hierarchy	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Corporate bonds	Level 2	$	621.1	$	1.5	$	(0.2)	$	622.4
Government securities	Level 2	63.6		0.1		—		63.7
Total		$	684.7	$	1.6	$	(0.2)	$	686.1

	December 31, 2024
(dollars in millions)	Valuation Hierarchy	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Corporate bonds	Level 2	$	934.4	$	1.7	$	(0.7)	$	935.4
Government securities	Level 2	3.5		—		—		3.5
Total		$	937.9	$	1.7	$	(0.7)	$	938.9