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Defined Benefit Plans - Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Effect on total of service and interest cost, 1-Percentage-Point Increase $ 0.0
Effect on total of service and interest cost, 1-Percentage-Point Increase 1.2
Effect on total of service and interest cost, 1-Percentage-Point Decrease (0.1)
Effect on total of service and interest cost, 1-Percentage-Point Decrease $ (1.3)