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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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Assets:
Unrealized gains on equity securities	$ 10.9	$ 67.9	$ 129.2	$ 93.9
Fair Value, Measurements, Recurring | Level 1
Assets:
Investments in equity securities	229.1		229.1		$ 98.6
Fair Value, Measurements, Recurring | Level 2
Assets:
Investments in equity securities	4.0		4.0		5.3
Fair Value, Measurements, Recurring | Level 3
Assets:
Investments in equity securities	$ 0.0		$ 0.0		$ 0.0

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