Fair Value Measurements - Schedule of Debt and Equity Securities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Available-for-sale debt securities, cost	$ 12.1	$ 0.0
Equity securities, cost	20.0	0.0
Total debt and equity securities, cost	32.1	0.0
Available-for-sale debt securities, fair value	12.3	0.0
Equity securities, fair value	20.0	0.0
Total debt and equity securities, fair value	32.3	0.0
Available-for-sale debt securities, gross unrealized gains	0.2	0.0
Available-for-sale debt securities, gross unrealized losses	$ 0.0	$ 0.0