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Fair Value (Available-For-Sale Securities) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value Disclosure [Line Items] |  |
Amortized Cost | $ 174.6 | $ 169.3
Gross Unrealized Gains | 0.0 | 3.8
Gross Unrealized Losses | (15.1) | (1.1)
Allowance for Credit Loss | (1.7) | (0.2)
Fair Value | 157.8 | 171.8
U.S. Treasury debt securities |  |
Fair Value Disclosure [Line Items] |  |
Amortized Cost | 69.7 | 52.8
Gross Unrealized Gains | 0.0 | 0.1
Gross Unrealized Losses | (4.8) | (0.4)
Allowance for Credit Loss | 0.0 | 0.0
Fair Value | 64.9 | 52.5
Debt Securities, Available-for-sale, Unrealized Loss Position | 62.3 | 36.2
Corporate/Other debt securities |  |
Fair Value Disclosure [Line Items] |  |
Amortized Cost | 104.9 | 116.5
Gross Unrealized Gains | 0.0 | 3.7
Gross Unrealized Losses | (10.3) | (0.7)
Allowance for Credit Loss | (1.7) | (0.2)
Fair Value | 92.9 | 119.3
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 85.1 | $ 35.4

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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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