Investments - Amortized Cost Basis (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale securities
Amortized Cost	$ 56.4	$ 50.0
Gross Unrealized Losses	(0.1)	(0.1)
Fair Value	57.7	50.7
Trading securities
Fair Value	22.7	19.2
Estimate of Fair Value Measurement
Available-for-sale securities
Amortized Cost	56.4	50.0
Gross Unrealized Gains	1.4	0.8
Gross Unrealized Losses	(0.1)	(0.1)
Fair Value	57.7	50.7
Trading securities
Amortized Cost	13.1	12.0
Gross Unrealized Gains	9.6	7.2
Gross Unrealized Losses	0.0	0.0
Fair Value	22.7	19.2
Investments, Amortized Cost	69.5	62.0
Investments, Gross Unrealized Gains	11.0	8.0
Investments, Gross Unrealized Loss	(0.1)	(0.1)
TOTAL INVESTMENTS	80.4	69.9
Reported Value Measurement
Available-for-sale securities
Fair Value	57.7	50.7
Trading securities
Fair Value	22.7	19.2
TOTAL INVESTMENTS	$ 80.4	$ 69.9

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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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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