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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, 2026	Dec. 31, 2025
Amortized Cost
Due in 1 year or less	$ 39.0
Instruments not due at a single maturity date	0.0
Amortized Cost	39.0
Fair Value
Due in 1 year or less	39.0
Instruments not due at a single maturity date	0.0
Fair Value	39.0
Amortized Cost
Due in 1 year or less	1,307.8
Instruments not due at a single maturity date	43.7
Amortized Cost	1,351.5	$ 1,301.6
Fair Value
Due in 1 year or less	1,307.2
Instruments not due at a single maturity date	42.8
Fair Value	$ 1,350.0	$ 1,300.5

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