v3.26.1
FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Assets:          
Unrealized gains on equity securities $ 12.0 $ 110.7 $ 36.4 $ 118.3  
Fair Value, Measurements, Recurring | Level 1          
Assets:          
Investments in equity securities 18.8   18.8   $ 15.3
Fair Value, Measurements, Recurring | Level 2          
Assets:          
Investments in equity securities 194.5   194.5   161.6
Fair Value, Measurements, Recurring | Level 3          
Assets:          
Investments in equity securities $ 0.0   $ 0.0   $ 0.0