Investments - Schedule of Amortized Cost Basis (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Available-for-sale securities
Amortized Cost	$ 78.0	$ 70.1
Gross Unrealized Losses	(0.4)	(0.6)
Fair Value	78.4	69.6
Trading securities
Fair Value	32.5	28.1
Estimate of Fair Value Measurement
Available-for-sale securities
Amortized Cost	78.0	70.1
Gross Unrealized Gains	0.8	0.1
Gross Unrealized Losses	(0.4)	(0.6)
Fair Value	78.4	69.6
Trading securities
Amortized Cost	13.5	13.5
Gross Unrealized Gains	19.0	14.6
Gross Unrealized Losses	0.0	0.0
Fair Value	32.5	28.1
Investments, Amortized Cost	91.5	83.6
Investments, Gross Unrealized Gains	19.8	14.7
Investments, Gross Unrealized Loss	(0.4)	(0.6)
TOTAL INVESTMENTS	110.9	97.7
Reported Value Measurement
Available-for-sale securities
Fair Value	78.4	69.6
Trading securities
Fair Value	32.5	28.1
TOTAL INVESTMENTS	$ 110.9	$ 97.7

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

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