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INVESTMENTS - Schedule of Investments in Continuous Loss Position (Details) $ in Millions | Mar. 31, 2021 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Fair value, less than twelve months | $ 296.1
Gross unrealized losses, less than twelve months | (1.8)
Fair value, twelve months or greater | 0.0
Gross unrealized losses, twelve months or greater | 0.0
Fair value, total | 296.1
Gross unrealized losses, total | (1.8)
U.S. government and agency securities |
Debt Securities, Available-for-sale [Line Items] |
Fair value, less than twelve months | 23.1
Gross unrealized losses, less than twelve months | (0.1)
Fair value, twelve months or greater | 0.0
Gross unrealized losses, twelve months or greater | 0.0
Fair value, total | 23.1
Gross unrealized losses, total | (0.1)
Asset-backed securities |
Debt Securities, Available-for-sale [Line Items] |
Fair value, less than twelve months | 58.6
Gross unrealized losses, less than twelve months | (0.2)
Fair value, twelve months or greater | 0.0
Gross unrealized losses, twelve months or greater | 0.0
Fair value, total | 58.6
Gross unrealized losses, total | (0.2)
Corporate debt securities |
Debt Securities, Available-for-sale [Line Items] |
Fair value, less than twelve months | 214.4
Gross unrealized losses, less than twelve months | (1.5)
Fair value, twelve months or greater | 0.0
Gross unrealized losses, twelve months or greater | 0.0
Fair value, total | 214.4
Gross unrealized losses, total | $ (1.5)

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- Definition Amount of 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 more than 12 months, 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 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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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 http://asc.fasb.org/extlink&oid=121645371&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 http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 + Details
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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 less than 12 months, 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 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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