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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Assets:
Unrealized gains (losses) on equity securities	$ 7.6	$ (14.7)
Fair Value, Measurements, Recurring | Level 1
Assets:
Investments in equity securities	106.2		$ 98.6
Fair Value, Measurements, Recurring | Level 2
Assets:
Investments in equity securities	5.3		5.3
Fair Value, Measurements, Recurring | Level 3
Assets:
Investments in equity securities	$ 0.0		$ 0.0

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