POSTRETIREMENT BENEFIT PLANS - Net Periodic Benefit Cost of Pension Plans and Other Employee Related Benefit Plans (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.7	$ 2.4	$ 5.1	$ 7.3
Interest cost	5.9	5.8	17.6	17.2
Expected return on plan assets	(5.3)	(5.1)	(16.0)	(15.2)
Amortization of prior service cost (benefit)	(1.4)	0.1	(4.0)	0.3
Amortization of net actuarial loss	2.4	3.3	7.0	10.0
Net periodic benefit cost	3.3	6.5	9.7	19.6
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	0.7	0	0.7
Defined Benefit Plan, Net Periodic Benefit Cost	3.3	7.2	9.7	20.3
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.2	1.7	3.7	5.1
Interest cost	3.9	3.7	11.7	11.0
Expected return on plan assets	(5.1)	(4.9)	(15.5)	(14.7)
Amortization of prior service cost (benefit)	0.1	0.2	0.5	0.6
Amortization of net actuarial loss	1.6	2.2	4.7	6.7
Net periodic benefit cost	1.7	2.9	5.1	8.7
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	0.7	0	0.7
Defined Benefit Plan, Net Periodic Benefit Cost	1.7	3.6	5.1	9.4
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.5	0.7	1.4	2.2
Interest cost	2.0	2.1	5.9	6.2
Expected return on plan assets	(0.2)	(0.2)	(0.5)	(0.5)
Amortization of prior service cost (benefit)	(1.5)	(0.1)	(4.5)	(0.3)
Amortization of net actuarial loss	0.8	1.1	2.3	3.3
Net periodic benefit cost	1.6	3.6	4.6	10.9
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 1.6	$ 3.6	$ 4.6	$ 10.9