Investments - Schedule of Debt Securities, Other Investments (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Cost	$ 48.2	$ 49.4
Unrealized gains	0.6	1.1
Unrealized losses	(0.7)	(0.5)
Debt securities	$ 48.1	$ 50.0

Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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+ Details