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Fair Value (Available-For-Sale Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair Value Disclosure [Line Items]
Amortized Cost	$ 141.3	$ 133.7
Gross Unrealized Gains	0.5	0.9
Gross Unrealized Losses	3.5	0.7
Fair Value	138.3	133.9
U.S. Treasury debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	23.6	26.9
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	0.1	0.1
Fair Value	23.6	26.8
Corporate/Other debt securities
Fair Value Disclosure [Line Items]
Amortized Cost	117.7	106.8
Gross Unrealized Gains	0.4	0.9
Gross Unrealized Losses	3.4	0.6
Fair Value	$ 114.7	$ 107.1

X

- Definition

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).

+ References

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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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