Schedule 1 - STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Millions	3 Months Ended																12 Months Ended
	Jan. 03, 2020		Sep. 27, 2019	[2]	Jun. 28, 2019	[3]	Mar. 29, 2019		Dec. 28, 2018		Sep. 28, 2018	[6]	Jun. 29, 2018	[7]	Mar. 30, 2018		Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Operating activities:
Net income	$ 101.0	[1]	$ 59.3		$ 63.5		$ 39.1	[4]	$ 41.8	[5]	$ 47.6		$ 34.8		$ 32.1	[8]	$ 262.9	$ 156.3	$ 109.0
Adjustments to reconcile net income to net cash used in operating activities:
Stock-based compensation																	20.0	18.9	18.1
Income tax expense																	30.5	66.9	128.6
Net cash used in operating activities																	227.9	137.7	183.8
Investing activities:
Other																	(2.9)	(9.1)	0.0
Net cash used in investing activities																	(37.1)	(183.4)	(41.1)
Financing activities:
Proceeds from stock options exercised																	4.7	1.5	5.0
Other, net																	(2.1)	0.0	(0.2)
Net cash provided by financing activities																	(195.9)	1.6	(136.1)
Parent Company [Member]
Operating activities:
Net income																	262.9	156.3	109.0
Adjustments to reconcile net income to net cash used in operating activities:
Equity in earnings of subsidiaries																	(260.2)	(154.1)	(108.0)
Dividend from subsidiary																	7.8	8.0	3.7
Stock-based compensation																	2.8	2.4	2.5
Income tax expense																	0.7	0.7	0.6
Intercompany transactions																	(17.3)	(14.7)	(13.2)
Changes in assets and liabilities, net																	(0.1)	(0.1)	(0.1)
Net cash used in operating activities																	(3.4)	(1.5)	(5.5)
Investing activities:
Other																	1.0	0.0	0.0
Net cash used in investing activities																	(1.0)	0.0	0.0
Financing activities:
Proceeds from stock options exercised																	4.7	1.5	5.0
Loans from subsidiaries, net																	0.0	0.0	0.7
Other, net																	0.0	0.0	(0.2)
Net cash provided by financing activities																	4.7	1.5	5.5
Increase in cash and cash equivalents																	0.3	0.0	0.0
Cash and cash equivalents at beginning of period							$ 0.2								$ 0.2		0.2	0.2	0.2
Cash and cash equivalents at end of period	$ 0.5								$ 0.2								$ 0.5	$ 0.2	$ 0.2

[1] In the fourth quarter of 2019, "Operating income" includes $8.6 million of intangible asset amortization and $12.8 million of merger costs. "Net income" includes a $45.9 million tax benefit related to the reversal of deferred income tax valuation allowances, partially offset by $0.8 million of tax expense related to prior year tax positions.

[2] In the third quarter of 2019, "Operating income" includes $8.8 million of intangible asset amortization.

[3] In the second quarter of 2019, "Operating income" includes $8.8 million of intangible asset amortization.

[4] In the first quarter of 2019, "Operating income" includes $8.8 million of intangible asset amortization and a reversal of acquisition and integration costs of $0.3 million.

[5] In the fourth quarter of 2018, "Operating income" includes $8.7 million of intangible asset amortization and $0.2 million of U.K. facility relocation costs. "Income before income taxes" includes a $4.6 million loss on extinguishment of debt.

[6] In the third quarter of 2018, "Operating income" includes $9.6 million of intangible asset amortization, a restructuring charge of $0.2 million, $0.3 million of acquisition and integration costs and $0.2 million of U.K. facility relocation costs.

[7] In the second quarter of 2018, "Operating income" includes $9.7 million of intangible asset amortization, a restructuring charge of $9.2 million, $2.3 million of acquisition and integration costs, $2.6 million of CEO retirement agreement expense and $0.4 million of U.K. facility relocation costs.

[8] In the first quarter of 2018, "Operating income" includes $9.3 million of intangible asset amortization, $0.3 million of acquisition and integration costs and $0.2 million of U.K. facility relocation costs.