Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Jan. 01, 2023	Jan. 02, 2022
Income Tax Contingency [Line Items]
Increase (decrease) in valuation allowance	$ 2.1
Expected decrease in unrecognized tax benefits over next 12 months	21.5
Interest and penalties related to unrecognized tax expense (benefit)	(10.3)	$ (12.2)	$ 2.4
Interest and penalties accrued for unrecognized tax benefits	36.9	45.6	160.8
Cash payments for federal, foreign and state income taxes	313.0	212.4	83.6
Tax refunds received totaled	14.7	$ 20.1	22.4
FLIR Systems, Inc
Income Tax Contingency [Line Items]
Interest and penalties accrued for unrecognized tax benefits			$ 157.0
Foreign
Income Tax Contingency [Line Items]
Net operating loss carryforward	32.3
Net operating loss carryforward with no expiration	28.0
Net operating loss carryforward with expiration	4.3
Foreign | Canadian
Income Tax Contingency [Line Items]
Capital loss carryforward	3.6
Tax credit carryforward	11.9
Foreign | Spanish
Income Tax Contingency [Line Items]
Tax credit carryforward	0.3
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforward	19.2
Net operating loss carryforward with no expiration	15.3
Net operating loss carryforward with expiration	3.9
State
Income Tax Contingency [Line Items]
Net operating loss carryforward	175.8
Research and development credit carryforward	15.4
State | No expiration
Income Tax Contingency [Line Items]
Research and development credit carryforward	10.1
State | With expiration
Income Tax Contingency [Line Items]
Research and development credit carryforward	$ 5.3