Investments - Schedule of Amortized Cost Basis (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Available-for-sale securities
Amortized Cost	$ 70.1	$ 65.3
Gross Unrealized Losses	(0.6)	(0.6)
Fair Value	69.6	65.0
Trading securities
Fair Value	28.1	23.4
Estimate of Fair Value Measurement
Available-for-sale securities
Amortized Cost	70.1	65.3
Gross Unrealized Gains	0.1	0.3
Gross Unrealized Losses	(0.6)	(0.6)
Fair Value	69.6	65.0
Trading securities
Amortized Cost	13.5	11.6
Gross Unrealized Gains	14.6	11.8
Gross Unrealized Losses	0.0	0.0
Fair Value	28.1	23.4
Investments, Amortized Cost	83.6	76.9
Investments, Gross Unrealized Gains	14.7	12.1
Investments, Gross Unrealized Loss	(0.6)	(0.6)
TOTAL INVESTMENTS	97.7	88.4
Reported Value Measurement
Available-for-sale securities
Fair Value	69.6	65.0
Trading securities
Fair Value	28.1	23.4
TOTAL INVESTMENTS	$ 97.7	$ 88.4

Debt Securities, Trading, and Equity Securities, FV-NI, Accumulated Unrealized Gain, before Tax

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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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Sum of the carrying amounts as of the balance sheet date of all investments.

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