Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS (Effect of One-Percentage Point Change in Assumed Healthcare Cost Trend Rates) (Detail)

v2.4.1.9
BENEFIT PLANS (Effect of One-Percentage Point Change in Assumed Healthcare Cost Trend Rates) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Effect of 1-percentage point increase on total service and interest cost components $ 0.1us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents
Effect of 1-percentage point increase on accumulated postretirement benefit obligation 1.6us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation
Effect of 1-percentage point decrease on total service and interest cost components (0.1)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1
Effect of 1-percentage point decrease on accumulated postretirement benefit obligation $ (1.4)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1