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Employee Stock And Savings (Narrative) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]      
Contribution $ 28.9 $ 32.1 $ 31.8
Deferred compensation plan assets 10.4 11.6  
Deferred compensation plan liabilities $ 10.4 $ 11.6  
Maximum percentage of salary deferral 50.00%    
Maximum deferral bonus afftert Tax 80.00%