v3.26.3
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, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Assets:          
Unrealized (losses) gains on equity securities $ (71.5) $ 10.9 $ (35.1) $ 129.2  
Fair Value, Measurements, Recurring | Level 1          
Assets:          
Investments in equity securities 12.4   12.4   $ 15.3
Fair Value, Measurements, Recurring | Level 2          
Assets:          
Investments in equity securities 129.4   129.4   161.6
Fair Value, Measurements, Recurring | Level 3          
Assets:          
Investments in equity securities $ 0.0   $ 0.0   $ 0.0