Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Additional Information (Detail)

v3.19.3.a.u2
Share-Based Compensation - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares authorized under 2014 Stock Incentive Plan 17,400,000    
Common shares remain for future issuance under share-based compensation plans 5,700,000    
Realized income tax benefit for all awards $ 8,300,000 $ 8,100,000 $ 9,400,000
Excess tax benefits on share-based compensation arrangements $ 5,800,000 53,100,000 31,100,000
Weighted-average grant date fair value of SARs granted $ 55.23    
Total vesting date fair value of stock units $ 13,000,000.0 $ 2,200,000 $ 2,000,000.0
Reserved for issuance under employee stock purchase plan 4,000,000.0    
Future issuance of employee stock purchase plan 3,200,000    
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, 2021 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% 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% 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 0 0 0
SARs [Member] | Performance conditions [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted 0 0  
SARs [Member] | Service condition [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted 0 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 $ 31,800,000 $ 26,200,000 $ 24,400,000
Unrecognized compensation cost on non-vested stock awards $ 43,300,000    
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     $ 14.32
Total intrinsic value of awards exercised for options and SARs $ 33,700,000 211,000,000.0 $ 122,800,000
Performance condition awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 6,800,000 9,200,000 $ 16,400,000
Unrecognized compensation cost on non-vested stock awards $ 5,600,000    
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition 1 year 4 months 24 days    
Weighted-average grant date fair value of SARs granted     $ 14.16
Total intrinsic value of awards exercised for options and SARs $ 100,000 95,000,000.0 $ 3,100,000
Market condition awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 0   1,300,000
Total intrinsic value of awards exercised for options and SARs $ 0 7,800,000 $ 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 0    
2004 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional awards 0    
2005 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional awards 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