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BENEFIT PLANS: (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Defined contribution plan and post-retirement defined benefit plans    
Defined benefit plan, net periodic benefit costs    
Service cost $ 1.9 $ 1.9
Interest cost 2.8 2.8
Expected return on plan assets (5.5) (4.7)
Amortization of prior service cost/ (credit) 0.1 0.2
Amortization of net loss/(gain) 0.1 0.3
Net periodic (benefit) cost (0.6) 0.5
Defined contribution plan and post-retirement defined benefit plans | Maximum    
Defined benefit plan, net periodic benefit costs    
Amortization of prior service cost/ (credit) 0.1 0.1
Post-retirement health care plans    
Defined benefit plan, net periodic benefit costs    
Interest cost 1.6 1.5
Net periodic (benefit) cost $ 1.6 $ 1.5