XML 130 R114.htm IDEA: XBRL DOCUMENT v3.3.1.900
Stock and Incentive Programs for Employees and Directors - Narrative (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
CompensationPlan
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation $ 17.3 $ 17.7 $ 19.9
Share-based compensation expense, income tax benefit 6.7 6.9 7.7
Unrecognized share-based compensation cost $ 19.3    
Unrecognized compensation expense, weighted-average period of recognition 1 year 9 months 18 days    
Number of active Share-based compensation plan | CompensationPlan 1    
Number of terminated or expired share-based compensation plans | CompensationPlan 1    
Restricted Stock      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award vesting term 3 years    
Restricted Stock | After January Two Thousand Nine      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award vesting term 3 years    
Restricted Stock | Between January 2008 And January 2009      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award vesting term 3 years    
Restricted Stock | Minimum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award vesting term 3 years    
Restricted Stock | Maximum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award vesting term 4 years    
Award term (in years) 10 years    
Stock options      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation $ 0.6 0.9 1.5
Unrecognized share-based compensation cost $ 0.1    
Unrecognized compensation expense, weighted-average period of recognition 2 months 12 days    
Stock options | Minimum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award vesting term 3 years    
Stock options | Maximum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award vesting term 4 years    
Award term (in years) 10 years    
Stock options | Maximum | After Retirement Date      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award term (in years) 5 years    
Performance share units      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation $ 5.1 $ 3.5 2.5
Unrecognized share-based compensation cost $ 6.7    
Unrecognized compensation expense, weighted-average period of recognition 1 year 8 months 12 days    
Equity instruments other than options, outstanding shares | shares 732,000 804,000  
Performance share units | Minimum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award vesting term 3 years    
Performance share units | Maximum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award vesting term 4 years    
Stock Compensation Plan      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common stock reserved and authorized (in shares) | shares 10,000,000    
Shares authorized and available for grant under the 2012 PIP | shares 5,700,000    
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    
Unrecognized compensation expense, weighted-average period of recognition 1 year 9 months 18 days    
Equity instruments other than options, outstanding shares | shares 1,670,000 2,045,000  
Restricted stock units | Liability Awards      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Equity instruments other than options, outstanding shares | shares 86,372 86,372 124,599
Performance Share Unit Awards      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award vesting term 3 years    
Performance Share Unit Awards | 2015 Award      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Amount payable as a percentage of initial award, contingent upon maximum performance 150.00%    
Performance Share Unit Awards | 2014 and 2013 Awards      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Amount payable as a percentage of initial award, contingent upon maximum performance 100.00%