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Investments - Schedule of Investments' Gross Unrealized Loss and Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 8.9 | $ 20.7
Unrealized Losses, Less than 12 Months | (0.2) | (0.4)
Fair Value, 12 Months or More | 19.9 | 1.0
Unrealized Losses, 12 Months or More | (2.0) | 0.0
Fair Value | 28.8 | 21.7
Unrealized Losses | (2.2) | (0.4)
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 4.7 | 16.8
Unrealized Losses, Less than 12 Months | (0.1) | (0.3)
Fair Value, 12 Months or More | 16.3 | 1.0
Unrealized Losses, 12 Months or More | (1.7) | 0.0
Fair Value | 21.0 | 17.8
Unrealized Losses | (1.8) | (0.3)
Corporate debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 4.2 | 3.9
Unrealized Losses, Less than 12 Months | (0.1) | (0.1)
Fair Value, 12 Months or More | 3.6 | 0.0
Unrealized Losses, 12 Months or More | (0.3) | 0.0
Fair Value | 7.8 | 3.9
Unrealized Losses | $ (0.4) | $ (0.1)

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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