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PENSION PLANS (Details 4) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components of Net Periodic Benefit Income [Abstract]      
Service cost $ 7.8 $ 5.3 $ 6.2
Interest cost 83.3 86.5 81.1
Expected return on plans' assets (147.4) (139.5) (137.5)
Amortization of prior service cost 1.6 2.2 1.9
Recognized actuarial loss 26.2 20.3 27.8
Curtailments/settlements 47.2 0.2 0.0
Net periodic benefit income (cost) 18.7 (25.0) (20.5)
Included in Other Comprehensive Loss (Pretax) [Abstract]      
Liability adjustment 125.4 138.9 14.4
Amortization of prior service costs and actuarial losses $ (62.4) $ (22.7) $ (29.7)