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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Restricted Securities Available For Sale [Line Items] |  |
Total restricted securities available for sale, cost | $ 101.5 | $ 94.6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.1 | 0.6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1.7 | 2.0
Debt Securities, Available-for-sale, Restricted | 99.9 | 93.2
Corporate Bond Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Total restricted securities available for sale, cost | 44.7 | 40.5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.0 | 0.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0.7 | 0.9
Debt Securities, Available-for-sale, Restricted | 44.0 | 39.9
US Government and Agency Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Total restricted securities available for sale, cost | 35.1 | 35.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.0 | 0.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0.8 | 0.9
Debt Securities, Available-for-sale, Restricted | 34.3 | 34.5
Asset-backed Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Total restricted securities available for sale, cost | 20.8 | 18.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.1 | 0.1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0.2 | 0.2
Debt Securities, Available-for-sale, Restricted | 20.7 | 17.9
Municipal Bonds |  |
Restricted Securities Available For Sale [Line Items] |  |
Total restricted securities available for sale, cost | 0.8 | 0.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.0 | 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Debt Securities, Available-for-sale, Restricted | 0.8 | 0.7
Mortgage-backed Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Total restricted securities available for sale, cost | 0.1 | 0.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.0 | 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Debt Securities, Available-for-sale, Restricted | $ 0.1 | $ 0.2

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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