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PENSION PLANS (Details 3) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]    
Projected benefit obligation $ 2,883.3 $ 2,717.2
Accumulated benefit obligation 2,851.0 2,685.7
Fair value of plan assets $ 2,246.9 $ 2,078.5