Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Additional Information (Detail)

v3.10.0.1
Share-Based Compensation - Additional Information (Detail)
12 Months Ended
Dec. 31, 2018
USD ($)
Plan
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of share-based compensation plans | Plan 4    
Common shares authorized under 2014 Stock Incentive Plan | shares 17,400,000    
Common shares remain for future issuance under share-based compensation plans | shares 6,300,000    
Realized income tax benefit for all awards $ 8,100,000 $ 9,400,000 $ 14,800,000
Excess tax benefits on share-based compensation arrangements $ 53,100,000 31,100,000 400,000
Weighted-average grant date fair value of SARs granted | $ / shares $ 43.75    
Total vesting date fair value of stock units $ 2,200,000 $ 2,000,000 $ 2,100,000
Reserved for issuance under employee stock purchase plan | shares 4,000,000    
Future issuance of employee stock purchase plan | shares 3,300,000    
Percent of fair market value for which eligible employees can purchase common shares under employee stock purchase plan 85.00%    
Performance conditions [Member] | First Succeeding Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance stock unit awards vesting percentage   20.00%  
Performance conditions [Member] | Second Succeeding Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance stock unit awards vesting percentage   20.00%  
Performance conditions [Member] | Third Succeeding Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance stock unit awards vesting percentage   60.00%  
Independent Director Stock Units [Member] | Performance conditions [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period beginning from the grant date 1 year    
Chief Executive Officer [Member] | Performance conditions [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance stock unit awards vesting date Dec. 31, 2020 Dec. 31, 2019  
Chief Executive Officer [Member] | Performance conditions [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance stock unit awards vesting percentage 0.00% 0.00%  
Chief Executive Officer [Member] | Performance conditions [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance stock unit awards vesting percentage 200.00% 200.00%  
Stock options and SARs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contractual term 10 years    
SARs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted | shares 0 0 0
SARs [Member] | Performance conditions [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted | shares 0    
SARs [Member] | Service condition [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted | shares 0    
SARs [Member] | Stock Incentive Plan Other [Member] | Performance conditions [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period beginning from the grant date 3 years    
Service condition awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 26,200,000 $ 24,400,000 $ 23,900,000
Unrecognized compensation cost on non-vested stock awards $ 38,000,000    
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition 1 year 3 months 18 days    
Weighted-average grant date fair value of SARs granted | $ / shares   $ 14.32 $ 14.67
Total intrinsic value of awards exercised for options and SARs $ 211,000,000 $ 122,800,000 $ 32,300,000
Performance condition awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 9,200,000 $ 16,400,000 $ 15,900,000
Unrecognized compensation cost on non-vested stock awards $ 11,200,000    
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition 1 year 7 months 6 days    
Weighted-average grant date fair value of SARs granted | $ / shares   $ 14.16 $ 14.85
Total intrinsic value of awards exercised for options and SARs $ 95,000,000 $ 3,100,000 $ 700,000
Market condition awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense   1,300,000 400,000
Total intrinsic value of awards exercised for options and SARs 7,800,000 $ 0 $ 0
Market condition awards [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 100,000    
Management Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional awards | shares 0    
2004 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional awards | shares 0    
2005 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional awards | shares 0    
Stock Incentive Plan [Member] | Performance conditions [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period beginning from the grant date 3 years    
Contractual term 3 years