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Employee plans - Additional Information (Detail)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
former_associate
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares of unissued common stock available for grant under the plans (in shares) | shares 8,100,000 8,100,000 8,100,000    
Share-based compensation expense     $ 14,500,000 $ 13,200,000 $ 13,200,000
Grants of stock option awards (in shares) | shares     0 0 0
Stock option awards outstanding (in shares) | shares 300,000 300,000 300,000    
Weighted-average exercise price of outstanding stock option awards (in dollars per share) | $ / shares $ 22.02 $ 22.02 $ 22.02    
Matching contribution by the company as percentage of participants' contribution     50.00%    
Percentage of eligible pay contributed by participants that will be matched     6.00%    
Cost recognized for contribution plans     $ 8,800,000 $ 8,200,000 $ 7,000,000.0
Deferred compensation liability $ 12,700,000 $ 12,700,000 12,700,000 14,700,000  
Non-cash pension settlement charge   142,100,000      
International Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Cost recognized for contribution plans     16,200,000 19,300,000 21,300,000
Pension Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Estimated cash contributions by the company in next fiscal year $ 250,600,000 250,600,000 250,600,000    
Pension Plans | U.S. Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Lump sum payments, number of former associates | former_associate 3,500        
Lump -sum payments $ 276,000,000.0        
Non-cash pension settlement charge 142,100,000   142,100,000 0 0
Estimated cash contributions by the company in next fiscal year 200,000,000.0 200,000,000.0 200,000,000.0    
Pension Plans | International Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-cash pension settlement charge     0 1,200,000 6,400,000
Estimated cash contributions by the company in next fiscal year 50,600,000 50,600,000 50,600,000    
Other Postretirement Benefit Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Estimated cash contributions by the company in next fiscal year 5,000,000 5,000,000 $ 5,000,000    
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Certain investments valued using net asset value as practical expedient, redemption notice period     120 days    
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense     $ 14,500,000 13,200,000 13,100,000
Aggregate weighted-average grant-date fair value of units granted     17,400,000 16,900,000 17,900,000
Total unrecognized compensation cost $ 12,600,000 $ 12,600,000 $ 12,600,000    
Unrecognized compensation cost, weighted-average recognition period     1 year 10 months 24 days    
Aggregate weighted-average grant-date fair value of units vested     $ 13,000,000.0 14,900,000 10,400,000
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense     $ 0 $ 0 $ 100,000
Performance-Based Unit | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares which will vest after achievement of goals (in shares) | shares     0    
Performance-Based Unit | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares which will vest after achievement of goals (in shares) | shares     2