Investments - Amortized Cost Basis (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale securities
Amortized Cost	$ 65.3	$ 62.6
Gross Unrealized Losses	(0.6)	(1.3)
Fair Value	65.0	61.4
Trading securities
Fair Value	23.4	18.8
Estimate of Fair Value Measurement
Available-for-sale securities
Amortized Cost	65.3	62.6
Gross Unrealized Gains	0.3	0.1
Gross Unrealized Losses	(0.6)	(1.3)
Fair Value	65.0	61.4
Trading securities
Amortized Cost	11.6	10.2
Gross Unrealized Gains	11.8	8.6
Gross Unrealized Losses	0.0	0.0
Fair Value	23.4	18.8
Investments, Amortized Cost	76.9	72.8
Investments, Gross Unrealized Gains	12.1	8.7
Investments, Gross Unrealized Loss	(0.6)	(1.3)
TOTAL INVESTMENTS	88.4	80.2
Reported Value Measurement
Available-for-sale securities
Fair Value	65.0	61.4
Trading securities
Fair Value	23.4	18.8
TOTAL INVESTMENTS	$ 88.4	$ 80.2

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

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

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Marketable Securities, Amortized Cost

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The amount of gross unrealized gains for securities, at a point in time, which are categorized either as available for sale or trading securities.

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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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Amortized cost of 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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Amount of 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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Cost of investment in debt investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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