Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details)

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BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Recognized actuarial (gain) loss - mark to market $ (1.4) $ (20.2)  
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1.5 1.4 $ 1.7
Interest cost 20.1 19.0 23.5
Expected return on plan assets (24.8) (28.7) (37.7)
Amortization of prior service cost (1.7) (1.8) (1.7)
Recognized actuarial (gain) loss - mark to market (2.7) 21.0 30.4
Settlements (1.0) 0.0 0.0
Total net periodic benefit cost (income) (8.6) 10.9 16.2
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.2 0.2 0.2
Interest cost 0.5 0.5 0.6
Expected return on plan assets (0.7) (0.7) (1.0)
Amortization of prior service cost (0.5) (0.1) (0.2)
Recognized actuarial (gain) loss - mark to market 0.5 (0.8) 1.8
Settlements 0.0 0.0 0.0
Total net periodic benefit cost (income) $ 0.0 $ (0.9) $ 1.4