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Stock and Incentive Programs for Employees and Directors - Restricted Stock Units - Narrative (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation $ 17.3 $ 17.7 $ 19.9
Unrecognized share-based compensation cost $ 19.3    
Unrecognized compensation expense, weighted-average period of recognition 1 year 9 months 18 days    
Restricted stock units      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation $ 11.6 13.3 15.9
Unrecognized share-based compensation cost $ 12.5    
Equity instruments other than options expected to vest, Shares 1.7    
Equity instruments other than options expected to vest, weighted-average grant date fair value $ 13.70    
Unrecognized compensation expense, weighted-average period of recognition 1 year 9 months 18 days    
Excess tax benefits shown as financing cash inflows $ 2.4 $ 2.5 $ 2.1