Reporting Segment And Geographic Information - Narratives (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jan. 03, 2020	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Segment Reporting Information [Line Items]
Revenue	$ 824.0	$ 783.9	$ 854.8	$ 801.6	$ 785.5	$ 795.2	$ 785.5	$ 742.2	$ 3,264.3	$ 3,108.4	$ 2,646.5
Ten Percent Customer member [Member] | Revenue Benchmark [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage									10.00%	10.00%	10.00%
Ten Percent Customer member [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Revenue									$ 0.0	$ 0.0	$ 0.0
Ten Percent Accounts Receivable member [Member] | Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage									10.00%	10.00%
Ten Percent Accounts Receivable member [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Revenue									$ 0.0	$ 0.0
Ten percent geographic area other than the U.S. [Member] | Geographic Concentration Risk [Member]
Segment Reporting Information [Line Items]
Revenue									$ 0.0	$ 0.0	$ 0.0