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BENEFIT PLANS - THE AMOUNTS IN AOCI THAT ARE EXPECTED TO BE AMORTIZED AS NET EXPENSE (INCOME) DURING NEXT FISCAL YEAR (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Retirement Benefits [Abstract]  
Amount of net prior service credit $ (0.5)
Amount of net loss 9.0
Total amount to be amortized out of AOCI in 2019 $ 8.5