Quarterly report pursuant to Section 13 or 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME (Reclassifications Out Of Accumulated Other Comprehensive Income) (Detail)

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ACCUMULATED OTHER COMPREHENSIVE INCOME (Reclassifications Out Of Accumulated Other Comprehensive Income) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Amortization of pension and other postretirement plan items:    
Total net periodic benefit cost, net of tax $ (2.2) $ (2.5)
Amount reclassified from accumulated other comprehensive income    
Amortization of pension and other postretirement plan items:    
Prior service cost [1] 0.1  
Recognized actuarial loss [1] (3.7)  
Total net periodic benefit cost, before tax (3.6)  
Total net periodic benefit cost, tax benefit 1.3  
Total net periodic benefit cost, net of tax $ (2.3)  
[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (See Note 9 Benefit Plans for additional details).