Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 84.8	$ 78.1	$ 209.9	$ 235.1
Foreign currency translation adjustments, net of tax	37.3	(26.9)	15.6	(21.4)
Net unrealized income, net of tax	0.0	0.0	0.2	0.2
Comprehensive income	122.1	51.2	225.7	213.9
Comprehensive income attributable to noncontrolling interests	0.1	0.0	0.3	0.1
Comprehensive income attributable to Trimble Inc.	$ 122.0	$ 51.2	$ 225.4	$ 213.8