ACCUMULATED OTHER COMPREHENSIVE INCOME (Reclassifications Out Of Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Amortization of pension and other postretirement plan items:
Net of tax		$ (17.5)	$ 61.1	$ (74.2)
Amount reclassified from accumulated other comprehensive income
Amortization of pension and other postretirement plan items:
Prior service cost	[1]	0.3
Recognized actuarial loss	[1]	(16.4)
Total before tax		(16.1)
Tax benefit		6.0
Net of tax		$ (10.1)

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (See Note 11 Benefit Plans for additional details).