FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, cash equivalents, and restricted cash	$ 133.5	$ 157.7
Marketable securities	162.1	162.2
EVE Investment	12.2	15.4
Total	307.8	335.3
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, cash equivalents, and restricted cash	133.5	157.7
Marketable securities	162.1	162.2
EVE Investment	2.5	4.0
Total	298.1	323.9
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, cash equivalents, and restricted cash	0.0	0.0
Marketable securities	0.0	0.0
EVE Investment	0.0	0.0
Total	0.0	0.0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, cash equivalents, and restricted cash	0.0	0.0
Marketable securities	0.0	0.0
EVE Investment	9.7	11.4
Total	$ 9.7	$ 11.4