XML 55 R42.htm IDEA: XBRL DOCUMENT v3.24.1.u1
BENEFIT PLANS: (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2024
USD ($)
plan
Mar. 31, 2023
USD ($)
Benefit plans    
Number of noncontributory defined benefit pension plans | plan 2  
Post retirement defined benefit plans and defined contribution plan    
Defined benefit plan, net periodic benefit costs    
Service cost $ 0.7 $ 0.5
Interest cost 0.9 0.8
Expected return on plan assets (1.5) (1.3)
Amortization of net loss/(gain)   0.1
Net periodic benefit cost 0.1 0.1
Post-retirement Health care plans    
Defined benefit plan, net periodic benefit costs    
Interest cost 0.5 0.5
Net periodic benefit cost 0.5 $ 0.5
Post-retirement Health care plans | Maximum    
Defined benefit plan, net periodic benefit costs    
Amortization of prior service cost / (credit) $ 0.1