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Investments - Marketable Securities (Details) $ in Millions	Dec. 31, 2024 USD ($)
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 51.4
Gross Gains	0.0
Gross Losses	(0.3)
Fair Value	51.1
Fair Value of Securities with Contractual Maturities
Within 1 Year	9.1
After 1 Year through 5 Years	34.5
After 5 Years	7.5
U.S. Treasury
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	20.4
Gross Gains	0.0
Gross Losses	(0.2)
Fair Value	20.2
Fair Value of Securities with Contractual Maturities
Within 1 Year	3.4
After 1 Year through 5 Years	13.8
After 5 Years	3.1
Municipal securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	10.0
Gross Gains	0.0
Gross Losses	0.0
Fair Value	10.0
Fair Value of Securities with Contractual Maturities
Within 1 Year	1.5
After 1 Year through 5 Years	7.0
After 5 Years	1.5
Corporate debt
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	21.0
Gross Gains	0.0
Gross Losses	(0.1)
Fair Value	20.9
Fair Value of Securities with Contractual Maturities
Within 1 Year	4.2
After 1 Year through 5 Years	13.7
After 5 Years	$ 2.9

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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