LIFO to FIFO Change in Accounting Principle - Cash Flow (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2025	Mar. 30, 2024
Net income attributable to ITT Inc.	$ 108.4	$ 111.5
Change in inventories	(5.6)	(1.7)
Change in income taxes	$ 11.8	10.3
Previously Reported
Net income attributable to ITT Inc.		111.0
Change in inventories		(1.0)
Change in income taxes		10.1
Revision of Prior Period, Adjustment
Net income attributable to ITT Inc.		0.5
Change in inventories		(0.7)
Change in income taxes		$ 0.2