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Retirement Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Expense related to defined contribution plan $ 48.9 $ 47.9 $ 42.5
Foreign [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Contribution towards defined benefit plans $ 18.7    
Minimum [Member] | U.S. and Puerto Rico [Member] | Equity Securities [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 30.00%    
Minimum [Member] | U.S. and Puerto Rico [Member] | Debt Securities [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 30.00%    
Minimum [Member] | U.S. and Puerto Rico [Member] | Non-Traditional Investments [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 0.00%    
Minimum [Member] | Foreign [Member] | Equity Securities [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 20.00%    
Minimum [Member] | Foreign [Member] | Debt Securities [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 30.00%    
Minimum [Member] | Foreign [Member] | Real Estate [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 15.00%    
Minimum [Member] | Foreign [Member] | Cash Fund [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 3.00%    
Minimum [Member] | Foreign [Member] | Other Funds [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 0.00%    
Maximum [Member] | U.S. and Puerto Rico [Member] | Equity Securities [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 65.00%    
Maximum [Member] | U.S. and Puerto Rico [Member] | Debt Securities [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 50.00%    
Maximum [Member] | U.S. and Puerto Rico [Member] | Non-Traditional Investments [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 15.00%    
Maximum [Member] | Foreign [Member] | Equity Securities [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 37.00%    
Maximum [Member] | Foreign [Member] | Debt Securities [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 50.00%    
Maximum [Member] | Foreign [Member] | Real Estate [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 24.00%    
Maximum [Member] | Foreign [Member] | Cash Fund [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 15.00%    
Maximum [Member] | Foreign [Member] | Other Funds [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Target range of assets held by defined benefit plan for cash funds 12.00%