BENEFIT PLANS - Fair Values of Pension Plan Assets (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	$ 625.8	$ 607.1	$ 647.9
Level 1, Level 2, and Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	612.0	590.2
Level 1, Level 2, and Level 3 | Debt funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	612.0	590.2
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
Level 1 | Debt funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	612.0	590.2
Level 2 | Debt funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	612.0	590.2
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
Level 3 | Debt funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0.0	0.0
Fair Value Measured at Net Asset Value Per Share | Interest in common/collective trusts (at NAV)
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	10.3	13.1
Fair Value Measured at Net Asset Value Per Share | Private partnerships (at NAV)
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	$ 3.5	$ 3.8