Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	[2]	Sep. 28, 2018	Sep. 29, 2017	[2]
Net income	$ 73.7	$ 57.2	[1]	$ 196.5	$ 154.3	[1],[3]
Foreign currency translation adjustments, net of tax	7.4	30.0		(22.8)	91.3
Net unrealized gain (loss) on short-term investments, net of tax	(0.1)	0.1		0.1	0.0
Net unrealized actuarial gain (loss), net of tax	0.0	(0.1)		0.2	(0.3)
Comprehensive income	81.0	87.2		174.0	245.3
Comprehensive gain attributable to noncontrolling interests	0.0	0.0		0.2	0.0
Comprehensive income attributable to Trimble Inc.	$ 81.0	$ 87.2		$ 173.8	$ 245.3

[1] See Note 2 for a summary of adjustments

[2] See Note 2 for a summary of adjustments

[3] See Note 2 for a summary of adjustments