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INVESTMENTS - Schedule of Unrealized Losses on Debt Securities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Fair value, continuous loss position less than 12 months | $ 182.1 | $ 375.6
Gross unrealized losses, continuous loss position less than 12 months | (1.1) | (1.7)
Fair value, continuous loss position 12 months or greater | 321.5 | 119.5
Gross unrealized losses, continuous loss position 12 months or greater | (4.4) | (1.2)
Total fair value, continuous loss position | 503.6 | 495.1
Total gross unrealized losses, continuous loss position | (5.5) | (2.9)
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, continuous loss position less than 12 months | 0.7 | 31.5
Gross unrealized losses, continuous loss position less than 12 months | (0.1) | (0.2)
Fair value, continuous loss position 12 months or greater | 56.5 | 37.1
Gross unrealized losses, continuous loss position 12 months or greater | (0.6) | (0.5)
Total fair value, continuous loss position | 57.2 | 68.6
Total gross unrealized losses, continuous loss position | (0.7) | (0.7)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, continuous loss position less than 12 months | 4.0 | 90.8
Gross unrealized losses, continuous loss position less than 12 months | 0.1 | (0.3)
Fair value, continuous loss position 12 months or greater | 61.3 | 23.2
Gross unrealized losses, continuous loss position 12 months or greater | (0.6) | (0.1)
Total fair value, continuous loss position | 65.3 | 114.0
Total gross unrealized losses, continuous loss position | (0.5) | (0.4)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, continuous loss position less than 12 months | 177.4 | 253.3
Gross unrealized losses, continuous loss position less than 12 months | (1.1) | (1.2)
Fair value, continuous loss position 12 months or greater | 203.7 | 59.2
Gross unrealized losses, continuous loss position 12 months or greater | (3.2) | (0.6)
Total fair value, continuous loss position | 381.1 | 312.5
Total gross unrealized losses, continuous loss position | $ (4.3) | $ (1.8)

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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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- 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. + 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 unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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