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Employee Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Employee Benefit Plans [Line Items]      
Tax-deferred contributions, description of plan The Company also maintains certain nonqualified supplemental benefit plans that allow participants to (i) make tax-deferred contributions and (ii) receive Company-provided allocations that cannot be made under the 401k Plan because of IRS limitations. The investment alternatives and returns are based on certain market-rate investment alternatives under the 401k Plan.    
Supplemental benefit plan liabilities $ 484.3 $ 464.9  
Derivative contracts, reasons for holding derivative instruments The Company has entered into derivative contracts to hedge market-driven changes in certain of the liabilities.    
Derivative contracts, fair value of derivatives indexed to the Company's stock $ 167.3    
Investment, indexed to Market Indices Fair Value $ 202.8    
Derivative contracts, disclosure of the effect on the results of operations Changes in liabilities for these nonqualified plans and in the fair value of the derivatives are recorded primarily in Selling, general & administrative expenses. Changes in fair value of the derivatives indexed to the Company’s stock are recorded in the income statement because the contracts provide the counterparty with a choice to settle in cash or shares.    
Maximum      
Schedule Of Employee Benefit Plans [Line Items]      
Participants' future contributions to the 401(k) feature and the discretionary employer matching contribution feature 20.00%    
U.S.      
Schedule Of Employee Benefit Plans [Line Items]      
Profit sharing and savings plan costs $ 19.3 24.8 $ 24.0
Outside the U.S.      
Schedule Of Employee Benefit Plans [Line Items]      
Profit sharing and savings plan costs 43.3 46.0 $ 53.4
Total liabilities for international retirement plans $ 44.6 $ 65.6