SEGMENT INFORMATION - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2025	Sep. 27, 2024	Sep. 26, 2025	Sep. 27, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Sales	$ 529.1	$ 531.7	$ 1,514.3	$ 1,606.6
Cost of sales	(260.5)	(251.9)	(753.9)	(776.2)
Operating expenses	(216.6)	(168.6)	(575.6)	(536.0)
Gain from sale of property	0.0	0.0	0.0	63.1
Operating profit	52.0	111.2	184.8	357.5
Non-operating expense, net:
Interest (expense) income, net	(16.3)		(16.3)
Loss from divestiture	0.0	0.0	0.0	(25.6)
Other non-operating (expenses) income, net	(0.5)	(0.3)	(1.1)	(1.0)
Earnings before income taxes	35.2	110.9	167.4	330.9
Depreciation and amortization expenses	(30.0)	(28.1)	(85.5)	(86.3)
Capital expenditures	(12.0)	(6.1)	(29.2)	(19.8)
Assets	5,265.1		5,265.1		$ 4,719.4
Test and Measurement
Segment Reporting Information [Line Items]
Sales	203.1	236.6	584.1	707.2
Sensors and Safety Systems
Segment Reporting Information [Line Items]
Sales	326.0	295.1	930.2	899.4
Operating Segments
Non-operating expense, net:
Assets	5,036.5		5,036.5		4,704.4
Operating Segments \| Test and Measurement
Segment Reporting Information [Line Items]
Sales	203.1	236.6	584.1	707.2
Cost of sales	(89.5)	(93.5)	(265.7)	(288.1)
Operating expenses	(115.3)	(113.8)	(346.3)	(370.6)
Gain from sale of property				63.1
Operating profit	(1.7)	29.3	(27.9)	111.6
Non-operating expense, net:
Interest (expense) income, net	(0.4)		(0.4)
Loss from divestiture				0.0
Other non-operating (expenses) income, net	0.0	(0.2)	(0.2)	(0.5)
Earnings before income taxes	(2.1)	29.1	(28.5)	111.1
Depreciation and amortization expenses	(26.2)	(24.5)	(74.8)	(75.1)
Capital expenditures	(1.0)	(3.3)	(11.0)	(12.0)
Assets	3,633.7		3,633.7		3,447.7
Operating Segments \| Sensors and Safety Systems
Segment Reporting Information [Line Items]
Sales	326.0	295.1	930.2	899.4
Cost of sales	(171.0)	(158.4)	(488.2)	(488.1)
Operating expenses	(64.9)	(54.7)	(185.3)	(165.4)
Gain from sale of property				0.0
Operating profit	90.1	82.0	256.7	245.9
Non-operating expense, net:
Interest (expense) income, net	0.8		0.8
Loss from divestiture				(25.6)
Other non-operating (expenses) income, net	0.0	(0.2)	(0.4)	(0.6)
Earnings before income taxes	90.9	81.8	257.1	219.7
Depreciation and amortization expenses	(3.4)	(3.6)	(10.3)	(11.2)
Capital expenditures	(4.5)	(2.8)	(11.7)	(7.8)
Assets	1,402.8		1,402.8		1,256.7
Unallocated Corporate Costs and Other
Segment Reporting Information [Line Items]
Sales	0.0	0.0	0.0	0.0
Cost of sales	0.0	0.0	0.0	0.0
Operating expenses	(36.4)	(0.1)	(44.0)	0.0
Gain from sale of property				0.0
Operating profit	(36.4)	(0.1)	(44.0)	0.0
Non-operating expense, net:
Interest (expense) income, net	(16.7)		(16.7)
Loss from divestiture				0.0
Other non-operating (expenses) income, net	(0.5)	0.1	(0.5)	0.1
Earnings before income taxes	(53.6)	0.0	(61.2)	0.1
Depreciation and amortization expenses	(0.4)	0.0	(0.4)	0.0
Capital expenditures	(6.5)	$ 0.0	(6.5)	$ 0.0
Other
Non-operating expense, net:
Assets	$ 228.6		$ 228.6		$ 15.0

Ralliant Corp 10-Q