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INVESTMENTS - Schedule of Investments in Continuous Loss Position (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | $ 56.1 | $ 182.1
Gross unrealized losses, less than twelve months | (0.2) | (1.1)
Fair value, twelve months or greater | 299.5 | 321.5
Gross unrealized losses, twelve months or greater | (2.0) | (4.4)
Fair value, total | 355.6 | 503.6
Gross unrealized losses, total | (2.2) | (5.5)
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 0.0 | 0.7
Gross unrealized losses, less than twelve months | 0.0 | (0.1)
Fair value, twelve months or greater | 56.7 | 56.5
Gross unrealized losses, twelve months or greater | (0.4) | (0.6)
Fair value, total | 56.7 | 57.2
Gross unrealized losses, total | (0.4) | (0.7)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 0.0 | 4.0
Gross unrealized losses, less than twelve months | 0.0 | 0.1
Fair value, twelve months or greater | 53.7 | 61.3
Gross unrealized losses, twelve months or greater | (0.3) | (0.6)
Fair value, total | 53.7 | 65.3
Gross unrealized losses, total | (0.3) | (0.5)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 56.1 | 177.4
Gross unrealized losses, less than twelve months | (0.2) | (1.1)
Fair value, twelve months or greater | 189.1 | 203.7
Gross unrealized losses, twelve months or greater | (1.3) | (3.2)
Fair value, total | 245.2 | 381.1
Gross unrealized losses, total | $ (1.5) | $ (4.3)

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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. + 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=82897076&loc=d3e27337-111563 + 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. + 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=82897076&loc=d3e27337-111563 + Details
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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 less than 12 months. + 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=82897076&loc=d3e27337-111563 + Details
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