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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Held-to-maturity |  |
Cost | $ 48.7 | $ 388.2
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 |
Fair Value | 48.7 | 388.2
Available-for-sale |  |
Cost | 583.0 | 685.3
Gross Unrealized Gains | 0.7 | 0.8
Gross Unrealized Losses | (6.2) | (2.9)
Fair Value | 577.5 | 683.2
Bank time deposits |  |
Held-to-maturity |  |
Cost | 45.7 | 382.9
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 45.7 | 382.9
Available-for-sale |  |
Cost | 0.5 | 0.5
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 0.5 | 0.5
Commercial paper |  |
Held-to-maturity |  |
Cost | 0.0 | 1.4
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 0.0 | 1.4
Available-for-sale |  |
Cost | 18.6 | 40.3
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 18.6 | 40.3
U.S. government and agency securities |  |
Held-to-maturity |  |
Cost | 3.0 | 3.9
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 3.0 | 3.9
Available-for-sale |  |
Cost | 69.5 | 69.4
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (0.9) | (0.7)
Fair Value | 68.6 | 68.7
Foreign government bonds |  |
Available-for-sale |  |
Cost | 3.0 | 3.0
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 3.0 | 3.0
Asset-backed securities |  |
Available-for-sale |  |
Cost | 96.8 | 121.2
Gross Unrealized Gains | 0.1 | 0.0
Gross Unrealized Losses | (1.0) | (0.4)
Fair Value | 95.9 | 120.8
Corporate debt securities |  |
Available-for-sale |  |
Cost | 390.2 | 446.5
Gross Unrealized Gains | 0.6 | 0.8
Gross Unrealized Losses | (4.3) | (1.8)
Fair Value | 386.5 | 445.5
Municipal securities |  |
Available-for-sale |  |
Cost | 4.4 | 4.4
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | $ 4.4 | $ 4.4

X
- 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=82897076&loc=d3e27161-111563 + Details
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