Investments - Amortized Cost Basis (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Available-for-sale securities
Fair Value	$ 50.7	$ 51.2
Trading securities
Fair Value	19.2	14.3
Estimate of Fair Value Measurement
Available-for-sale securities
Amortized Cost	50.0	54.0
Gross Unrealized Gains	0.8	1.1
Gross Unrealized Losses	(0.1)	(3.9)
Fair Value	50.7	51.2
Trading securities
Amortized Cost	12.0	10.1
Gross Unrealized Gains	7.2	4.2
Gross Unrealized Losses	0.0	0.0
Fair Value	19.2	14.3
Investments, amortized cost	62.0	64.1
Investments, Gross Unrealized Gains	8.0	5.3
Investments, Gross Unrealized Loss	(0.1)	(3.9)
TOTAL INVESTMENTS	69.9	65.5
Reported Value Measurement
Available-for-sale securities
Fair Value	50.7	51.2
Trading securities
Fair Value	19.2	14.3
TOTAL INVESTMENTS	$ 69.9	$ 65.5

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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Marketable Securities, Unrealized Loss

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Trading Securities, Accumulated Gross Unrealized Gain, before Tax

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Trading Securities, Accumulated Gross Unrealized Loss, 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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Amount, before tax, of unrealized loss 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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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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