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Fair Value (Available-For-Sale Securities) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Fair Value Disclosure [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 0.0 |  | $ 17.2 |
Amortized Cost | 148.4 |  | 150.1 |
Gross Unrealized Gains | 2.9 |  | 4.3 |
Gross Unrealized Losses | (5.5) | [1] | (0.2) | [2]
Allowance for Credit Loss | (1.2) |  | 0.0 |
Fair Value | 144.6 |  | 154.2 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 54.0 |  | 12.2 |
U.S. Treasury debt securities |  |  |  |
Fair Value Disclosure [Line Items] |  |  |  |
Amortized Cost | 26.7 |  | 31.4 |
Gross Unrealized Gains | 0.7 |  | 0.1 |
Gross Unrealized Losses | 0.0 | [1] | (0.1) | [2]
Fair Value | 27.4 |  | 31.4 |
Corporate/Other debt securities |  |  |  |
Fair Value Disclosure [Line Items] |  |  |  |
Amortized Cost | 121.7 |  | 118.7 |
Gross Unrealized Gains | 2.2 |  | 4.2 |
Gross Unrealized Losses | (5.5) | [1] | (0.1) | [2]
Fair Value | $ 117.2 |  | $ 122.8 |
[1] | (1)Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $0 and $54 million, respectively, at March 31, 2020.
[2] | (2)Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $17.2 million and $12.2 million, respectively, at December 31, 2019.

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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 http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition 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). + 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 (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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