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Retirement Benefits - Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost of Plans (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other Benefits                  
Defined Benefit Plan Disclosure [Line Items]                  
Discount rate             2.70% 2.20% 3.09%
Expected return on plan assets             0.00% 0.00% 0.00%
Rate of compensation increase             0.00% 0.00% 4.00%
Pension Benefits | U.S. Plans                  
Defined Benefit Plan Disclosure [Line Items]                  
Discount rate             2.52% 2.14%  
Expected return on plan assets             2.63% 2.40% 4.00%
Rate of compensation increase             0.00% 0.00% 0.00%
Pension Benefits | U.S. Plans | IDEX Corporation Retirement Plan                  
Defined Benefit Plan Disclosure [Line Items]                  
Discount rate 2.36% 2.41% 2.97% 3.07%          
Pension Benefits | U.S. Plans | Pulsafeeder, Inc. Pension Plan                  
Defined Benefit Plan Disclosure [Line Items]                  
Discount rate         2.62% 3.21%      
Pension Benefits | Non-U.S. Plans                  
Defined Benefit Plan Disclosure [Line Items]                  
Discount rate             1.25% 0.95% 1.33%
Expected return on plan assets             2.87% 2.41% 3.00%
Rate of compensation increase             2.31% 2.32% 2.29%