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, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Recognized actuarial loss (gain) - mark to market $ 20.2 $ 32.2  
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1.4 1.7 $ 2.8
Interest cost 19.0 23.5 28.3
Expected return on plan assets (28.7) (37.7) (34.3)
Amortization of prior service cost (1.8) (1.7) 0.5
Recognized actuarial loss (gain) - mark to market 21.0 30.4 0.2
Total net periodic benefit cost (income) 10.9 16.2 (2.5)
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.2 0.2 0.3
Interest cost 0.5 0.6 0.9
Expected return on plan assets (0.7) (1.0) (0.9)
Amortization of prior service cost (0.1) (0.2) (1.0)
Recognized actuarial loss (gain) - mark to market (0.8) 1.8 (5.0)
Total net periodic benefit cost (income) $ (0.9) $ 1.4 $ (5.7)