v3.26.1
FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Financial instruments    
Preferred stock $ 30.4 $ 30.4
Carrying amount    
Financial instruments    
Preferred stock 30.4 30.4
Long-term debt, including current portion 5,611.5 4,525.3
Fair value    
Financial instruments    
Preferred stock 21.3 21.2
Long-term debt, including current portion $ 5,456.6 $ 4,434.6