Fair Value Measurements - Schedule of Company Financial Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jul. 29, 2025	Dec. 31, 2024
Micro-LAM, Inc
Liabilities
Contingent consideration	$ 1.2
Business combination, potential earnout of maximum	12.0	$ 12.0
Fair Value, Recurring
Liabilities
Contingent consideration	1.2
Fair Value, Recurring \| Mutual Funds Held in Nonqualified SERP
ASSETS
Trading securities - mutual funds held in nonqualified SERP	12.1		$ 10.6
Fair Value, Recurring \| Level 1
Liabilities
Contingent consideration	0.0
Fair Value, Recurring \| Level 1 \| Mutual Funds Held in Nonqualified SERP
ASSETS
Trading securities - mutual funds held in nonqualified SERP	12.1		10.6
Fair Value, Recurring \| Level 2
Liabilities
Contingent consideration	0.0
Fair Value, Recurring \| Level 2 \| Mutual Funds Held in Nonqualified SERP
ASSETS
Trading securities - mutual funds held in nonqualified SERP	0.0		0.0
Fair Value, Recurring \| Level 3
Liabilities
Contingent consideration	1.2
Fair Value, Recurring \| Level 3 \| Mutual Funds Held in Nonqualified SERP
ASSETS
Trading securities - mutual funds held in nonqualified SERP	$ 0.0		$ 0.0

IDEX CORP /DE/ 10-Q