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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 914.7 | $ 924.3
Gross Unrealized Gains | 8.1 | 11.6
Gross Unrealized Losses | (1.8) | 0.0
Fair Value | 921.0 | 935.9
Bank time deposits |  |
Held-to-maturity |  |
Amortized Cost | 0.0 | 50.0
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 0.0 | 50.0
Available-for-sale |  |
Amortized Cost | 14.1 | 24.1
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 14.1 | 24.1
U.S. government and agency securities |  |
Available-for-sale |  |
Amortized Cost | 136.4 | 147.0
Gross Unrealized Gains | 1.8 | 2.2
Gross Unrealized Losses | (0.1) | 0.0
Fair Value | 138.1 | 149.2
Foreign government bonds |  |
Available-for-sale |  |
Amortized Cost | 0.0 | 0.0
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 0.0 | 0.0
Asset-backed securities |  |
Available-for-sale |  |
Amortized Cost | 161.1 | 149.6
Gross Unrealized Gains | 1.3 | 1.9
Gross Unrealized Losses | (0.2) | 0.0
Fair Value | 162.2 | 151.5
Corporate debt securities |  |
Available-for-sale |  |
Amortized Cost | 600.3 | 600.8
Gross Unrealized Gains | 5.0 | 7.5
Gross Unrealized Losses | (1.5) | 0.0
Fair Value | 603.8 | 608.3
Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 2.8 | 2.8
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | $ 2.8 | $ 2.8

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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=121645371&loc=d3e27161-111563 + Details
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