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POSTRETIREMENT BENEFIT PLANS - Net Periodic Benefit Cost of Pension Plans and Other Employee Related Benefit Plans (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.6 $ 1.0 $ 1.8 $ 2.6
Interest cost 4.0 4.1 11.8 12.4
Expected return on plan assets(a) (4.4) (4.0) [1] (11.4) (11.7) [1]
Amortization of prior service cost (benefit) (1.1) (1.2) (3.3) (3.6)
Amortization of net actuarial loss 2.4 3.2 7.6 8.8
Net Periodic Benefit Cost 1.5 3.1 6.5 8.5
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment (1.4) (3.7) (1.4) (3.7)
Total net periodic benefit cost 2.9 6.8 7.9 12.2
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.4 0.8 1.2 2.0
Interest cost 3.0 3.0 8.6 9.0
Expected return on plan assets(a) (4.4) (3.9) (11.2) (11.4)
Amortization of prior service cost (benefit) 0.2 0.2 0.6 0.7
Amortization of net actuarial loss 1.5 2.1 4.5 5.6
Net Periodic Benefit Cost 0.7 2.2 3.7 5.9
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment (1.4) (3.7) (1.4) (3.7)
Total net periodic benefit cost 2.1 5.9 5.1 9.6
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.2 0.2 0.6 0.6
Interest cost 1.0 1.1 3.2 3.4
Expected return on plan assets(a) 0.0 (0.1) (0.2) (0.3)
Amortization of prior service cost (benefit) (1.3) (1.4) (3.9) (4.3)
Amortization of net actuarial loss 0.9 1.1 3.1 3.2
Net Periodic Benefit Cost 0.8 0.9 2.8 2.6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0.0 0.0 0.0 0.0
Total net periodic benefit cost $ 0.8 $ 0.9 $ 2.8 $ 2.6
[1] (a) Plan administrative expenses of $0.7 and $2.3 for the three and nine months ended September 30, 2017, respectively have been reclassified from the service cost component line to the expected return on plan assets component line to conform to the current year presentation.