Annual report pursuant to Section 13 and 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
 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).