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Employee Benefits - Change In Plan Assets (Detail) - Pension Plans, Defined Benefit - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair Value at beginning of year $ 1,601.2  
Employer Contributions 10.6 $ 3.0
Fair Value at end of year 1,793.7 1,601.2
U.S. Plan    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair Value at beginning of year 1,601.2 1,380.1
Actual Return on Assets 272.5 291.8
Employer Contributions 0.0 0.0
Employee Contributions 0.0 0.0
Settlement 0.0 0.0
Benefits Paid (80.0) (70.7)
Foreign Exchange Rate Changes 0.0 0.0
Fair Value at end of year 1,793.7 1,601.2
Non U.S. Plans    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair Value at beginning of year 190.1 166.7
Actual Return on Assets 17.9 18.6
Employer Contributions 5.0 3.1
Employee Contributions 0.6 0.6
Settlement (5.4) 0.0
Benefits Paid (4.1) (3.6)
Foreign Exchange Rate Changes 7.4 4.7
Fair Value at end of year $ 211.5 $ 190.1