Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS (Benefit Costs Included in Accumulated Other Comprehensive Loss that have not yet Recognized in Net Periodic Pension Cost) (Detail)

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BENEFIT PLANS (Benefit Costs Included in Accumulated Other Comprehensive Loss that have not yet Recognized in Net Periodic Pension Cost) (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Accumulated other comprehensive loss $ 245.8 $ 263.3 $ 202.2
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Prior service cost, net of accumulated taxes of $3.6 and $4.0 in 2015 and 2014, respectively, for pension benefits and $(1.6) and $(2.1) in 2015 and 2014, respectively, for other benefits 6.1 6.6  
Net actuarial loss, net of accumulated taxes of $132.6 and $145.5 in 2015 and 2014, respectively, for pension benefits and $3.6 and $2.7 in 2015 and 2014, respectively, for other benefits 236.4 255.7  
Accumulated other comprehensive loss 242.5 262.3  
Prior service cost, accumulated taxes 4.0 4.0  
Net Actuarial Loss, Accumulated Taxes 132.6 146.0  
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Prior service cost, net of accumulated taxes of $3.6 and $4.0 in 2015 and 2014, respectively, for pension benefits and $(1.6) and $(2.1) in 2015 and 2014, respectively, for other benefits (2.8) (3.5)  
Net actuarial loss, net of accumulated taxes of $132.6 and $145.5 in 2015 and 2014, respectively, for pension benefits and $3.6 and $2.7 in 2015 and 2014, respectively, for other benefits 6.1 4.5  
Accumulated other comprehensive loss 3.3 1.0  
Prior service cost, accumulated taxes (1.6) (2.1)  
Net Actuarial Loss, Accumulated Taxes $ 3.6 $ 2.7