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BENEFIT PLANS - OTHER CHANGES IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN AOCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]      
Net actuarial loss (gain) $ 52.6 $ (5.8) $ 13.3
Net prior service cost (credit) 0.0 (3.5) 0.3
Amortization (5.1) (6.0) (6.7)
Total recognized in AOCI 47.5 (15.3) 6.9
Total recognized in net periodic benefit cost and AOCI $ 75.6 $ 7.7 $ 31.8