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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

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