Investments - Amortized Cost Basis (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Available-for-sale securities
Amortized Cost	$ 54.0
Fair Value	51.2	$ 58.4
Trading securities
Fair Value	14.3	13.8
Estimate of Fair Value Measurement
Available-for-sale securities
Amortized Cost	54.0	59.3
Gross Unrealized Gains	1.1	0.1
Gross Unrealized Losses	(3.9)	(1.0)
Fair Value	51.2	58.4
Trading securities
Amortized Cost	10.1	8.9
Gross Unrealized Gains	4.2	4.9
Gross Unrealized Losses	0.0	0.0
Fair Value	14.3	13.8
Investments, amortized cost	64.1	68.2
Investments, Gross Unrealized Gains	5.3	5.0
Investments, Gross Unrealized Loss	(3.9)	(1.0)
TOTAL INVESTMENTS	65.5	72.2
Reported Value Measurement
Available-for-sale securities
Fair Value	51.2	58.4
Trading securities
Fair Value	14.3	13.8
TOTAL INVESTMENTS	$ 65.5	$ 72.2

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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Trading Security, 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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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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