Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS (Components of Net Periodic Benefit Cost) (Details)

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BENEFIT PLANS (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Service cost $ 3.6 $ 4.2 $ 4.5
Interest cost 31.3 30.4 31.1
Expected return on plan assets (37.6) (39.6) (39.7)
Amortization of prior service cost 0.8 0.9 0.8
Recognized actuarial loss (gain) 13.6 15.8 12.9
Total net periodic benefit cost (income) 11.7 11.7 9.6
Other Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Service cost 0.3 0.3 0.3
Interest cost 0.8 0.7 0.8
Expected return on plan assets (1.4) (1.5) (1.6)
Amortization of prior service cost (1.1) (1.2) 0.6
Recognized actuarial loss (gain) 0.8 0.6 (1.2)
Total net periodic benefit cost (income) $ (0.6) $ (1.1) $ (1.1)