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INVESTMENTS - Schedule of Cost and Fair Value of Investments in Debt Securities, By Contractual Maturity (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due in 1 year or less | $ 35.0 |
Due after 1 year through 5 years | 0.0 |
Due after 5 years through 10 years | 0.0 |
Instruments not due at a single maturity date | 0.0 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss | 35.0 |
Fair Value |  |
Due in 1 year or less | 35.0 |
Due after 1 year through 5 years | 0.0 |
Due after 5 years through 10 years | 0.0 |
Instruments not due at a single maturity date | 0.0 |
Fair Value | 35.0 |
Amortized Cost |  |
Due in 1 year or less | 212.1 |
Due after 1 year through 5 years | 663.6 |
Due after 5 years through 10 years | 10.2 |
Instruments not due at a single maturity date | 253.7 |
Amortized Cost | 1,139.6 | $ 924.3
Fair Value |  |
Due in 1 year or less | 213.4 |
Due after 1 year through 5 years | 667.1 |
Due after 5 years through 10 years | 10.4 |
Instruments not due at a single maturity date | 255.1 |
Fair Value | $ 1,146.0 | $ 935.9

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- Definition Amortized cost of investment in debt security, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in rolling sixth through tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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