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Restricted Securities Available For Sale (Restricted Securities Available For Sale) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | $ 62.0 | $ 64.1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 0.5 | 2.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0.4 | 0.0
Debt Securities, Available-for-sale, Restricted | [1] | 62.1 | 66.1
Corporate bonds [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 27.3 | 31.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 0.3 | 1.1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0.2 | 0.0
Debt Securities, Available-for-sale, Restricted |  | 27.4 | 32.4
US Government and agency securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 21.5 | 19.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 0.2 | 0.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0.1 | 0.0
Debt Securities, Available-for-sale, Restricted |  | 21.6 | 20.4
Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 12.9 | 12.7
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 |  | 0.1 | 0.0
Debt Securities, Available-for-sale, Restricted |  | 12.8 | 12.9
Mortgage-backed securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 0.3 | 0.4
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 |  | $ 0.3 | $ 0.4
[1] | Measured at fair value on a recurring basis.

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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=123581744&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=123581744&loc=d3e27161-111563 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount of restricted 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 -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120413209&loc=SL6242269-115581 + Details
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