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INVESTMENTS - Schedule of Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Cost |  |
Due in 1 year or less | $ 20.0 |
Due after 1 year through 5 years | 0.0 |
Instruments not due at a single maturity date | 0.0 |
Cost | 20.0 | $ 388.2
Fair Value |  |
Due in 1 year or less | 20.0 |
Due after 1 year through 5 years | 0.0 |
Instruments not due at a single maturity date | 0.0 |
Total | 20.0 | 388.2
Cost |  |
Due in 1 year or less | 223.2 |
Due after 1 year through 5 years | 385.6 |
Instruments not due at a single maturity date | 102.5 |
Cost | 711.3 | 685.3
Fair Value |  |
Due in 1 year or less | 222.4 |
Due after 1 year through 5 years | 381.7 |
Instruments not due at a single maturity date | 102.1 |
Total | $ 706.2 | $ 683.2

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