Investments - Amortized Cost Basis (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Available-for-sale securities
Amortized Cost	$ 62.6	$ 53.3
Gross Unrealized Losses	(1.3)	(0.1)
Fair Value	61.4	54.0
Trading securities
Fair Value	18.8	24.5
Estimate of Fair Value Measurement
Available-for-sale securities
Amortized Cost	62.6	53.3
Gross Unrealized Gains	0.1	0.8
Gross Unrealized Losses	(1.3)	(0.1)
Fair Value	61.4	54.0
Trading securities
Amortized Cost	10.2	12.2
Gross Unrealized Gains	8.6	12.3
Gross Unrealized Losses	0.0	0.0
Fair Value	18.8	24.5
Investments, Amortized Cost	72.8	65.5
Investments, Gross Unrealized Gains	8.7	13.1
Investments, Gross Unrealized Loss	(1.3)	(0.1)
TOTAL INVESTMENTS	80.2	78.5
Reported Value Measurement
Available-for-sale securities
Fair Value	61.4	54.0
Trading securities
Fair Value	18.8	24.5
TOTAL INVESTMENTS	$ 80.2	$ 78.5

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

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Marketable Securities, Amortized Cost

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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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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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