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Benefit Plans Textuals (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan, Cost $ 19,300 $ 18,800 $ 18,900
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation 205,300 184,400  
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation 216,700 195,300  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets $ 57,400 $ 51,500  
Pension Plan [Member] | UNITED STATES      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.22% 3.03%  
Defined Benefit Plan, Accumulated Benefit Obligation $ 149,900 $ 142,500  
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description Target asset allocation ranges for the U.S. pension plan include 40-60% in equity securities, 23-33% in fixed income securities, and 15-25% in other types of investments.    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 3.03% 4.11% 3.49%
Pension Plan [Member] | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 0.32% 0.51%  
Defined Benefit Plan, Accumulated Benefit Obligation $ 920,300 $ 812,000  
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description International plan assets relate primarily to the Company’s Swiss plan with target allocations of 24-45% in equities, 35-55% in fixed income securities, and 15-25% in other types of investments.    
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 27,900    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 0.51% 1.22% 0.97%
Other Postretirement Benefits Plan [Member] | UNITED STATES      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 1.47% 2.54%  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 200    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 2.54% 3.75% 3.15%
Healthcare Cost Trend Rate Maximum 6.00% 6.40%  
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 4.50%    
Healthcare Cost Trend Rate Minimum Percentage 6.20%