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BENEFIT PLANS - PENSION PLANS WITH AN ACCUMULATED BENEFIT OBLIGATION IN EXCESS OF PLAN ASSETS (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]    
Projected benefit obligation $ 377.7 $ 435.1
Accumulated benefit obligation 361.0 397.2
Fair value of plan assets $ 140.7 $ 141.8