v3.26.1
PENSION AND POST-RETIREMENT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, net of tax:        
Total recognized in other comprehensive (income) loss $ 0.5 $ 0.9 $ 1.0 $ 1.7
Pension Benefits        
Components of Net Periodic Benefit Cost (credit):        
Service cost 1.3 1.1 2.5 2.2
Interest cost 2.5 2.6 5.1 5.2
Expected return on plan assets (3.8) (4.4) (8.2) (8.8)
Net periodic benefit credit   (0.7) (0.6) (1.4)
Post-retirement benefits        
Components of Net Periodic Benefit Cost (credit):        
Service cost   0.1 0.1 0.1
Interest cost 0.3 0.2 0.5 0.5
Amortization of net actuarial loss (gain) (0.1) (0.1) (0.3) (0.3)
Amortization of prior service credit (0.6) (1.0) (1.1) (1.9)
Net periodic benefit credit $ (0.4) $ (0.8) $ (0.8) $ (1.6)