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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Amortization of pension and other postretirement plan items:        
Total net periodic benefit cost, net of tax $ (2.6) $ (2.2) $ (7.7) $ (6.4)
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]     (12.3)  
Total net periodic benefit cost, before tax     (12.0)  
Total net periodic benefit cost, tax benefit     4.5  
Total net periodic benefit cost, net of tax     $ (7.5)  
[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (See Note 8 Benefit Plans for additional details).