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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 04, 2026
Jun. 28, 2025
Jul. 04, 2026
Jun. 28, 2025
Statement of Comprehensive Income [Abstract]        
Net income $ 86.5 $ 121.7 $ 165.9 $ 230.8
Other comprehensive (loss) income:        
Net foreign currency translation adjustment 1.9 80.0 (52.2) 107.3
Net change in postretirement benefit plans, net of tax impacts of $0.3, $0.4, $0.5, and $0.7, respectively (0.8) (1.1) (1.6) (2.3)
Other comprehensive (loss) income 1.1 78.9 (53.8) 105.0
Comprehensive income 87.6 200.6 112.1 335.8
Less: Comprehensive income attributable to noncontrolling interests 1.6 0.7 3.0 1.4
Comprehensive income attributable to ITT Inc. 86.0 199.9 109.1 334.4
Disclosure of reclassification adjustments to postretirement benefit plans:        
Amortization of prior service benefit, net of tax expense of $0.2, $0.4, $0.4, and $0.7 respectively (0.7) (1.1) (1.4) (2.2)
Amortization of net actuarial loss, net of tax benefit of $0.1, $0.0, $0.1, and $0.0, respectively (0.1) 0.0 (0.2) (0.1)
Net change in postretirement benefit plans, net of tax $ 0.8 $ 1.1 $ 1.6 $ 2.3