Consolidated Statements of Equity - USD ($) $ in Millions	Total	Equity Incentive Plan	Cumulative effect of changes in accounting principle, net of taxes	Common Shares	Common Shares Equity Incentive Plan	Additional Paid-in-Capital	Additional Paid-in-Capital Equity Incentive Plan	Retained Earnings	Retained Earnings Cumulative effect of changes in accounting principle, net of taxes	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 28, 2019				134,803,000
Beginning Balance at Dec. 28, 2019	$ 1,166.2		$ (3.6)	$ 892.3		$ 77.4		$ 265.0	$ (3.6)	$ (68.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(132.5)							(132.5)
Other comprehensive income (loss), net of tax	(21.5)									(21.5)
Common shares dividends	(19.5)							(19.5)
Share-based compensation	7.3					7.3
Common shares issued in connection with business combination and assumed vested awards, net of equity issuance costs of $1.1 million (in shares)				26,497,000
Common shares issued in connection with business combination and assumed vested awards, net of equity issuance costs of $1.1 million	379.4			$ 376.5		2.9
Common shares repurchased and canceled (in shares)				(2,796,000)
Common shares repurchased and canceled	(32.2)			$ (22.5)				(9.7)
Common shares issued - Equity Incentive Plan (in shares)					1,452,000
Common shares issued - Equity Incentive Plan		$ 4.1			$ 16.3		$ (12.2)
Common shares issued - Dividend Reinvestment Plan (in shares)				1,000
Common shares issued - Employee Stock Purchase Plan (in shares)				62,000
Common shares issued - Employee Stock Purchase Plan	0.5			$ 0.7		(0.2)
Ending Balance (in shares) at Jun. 27, 2020				160,019,000
Ending Balance at Jun. 27, 2020	1,348.2			$ 1,263.3		75.2		99.7		(90.0)
Beginning Balance (in shares) at Mar. 28, 2020				159,826,000
Beginning Balance at Mar. 28, 2020	1,480.7		$ 0.7	$ 1,262.7		71.5		244.9	$ 0.7	(98.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(136.0)							(136.0)
Other comprehensive income (loss), net of tax	8.4									8.4
Common shares dividends	(9.9)							(9.9)
Share-based compensation	4.2					4.2
Common shares repurchased and canceled (in shares)				(20,000)
Common shares repurchased and canceled	(0.3)			$ (0.3)
Common shares issued - Equity Incentive Plan (in shares)					175,000
Common shares issued - Equity Incentive Plan		0.2			$ 0.6		(0.4)
Common shares issued - Dividend Reinvestment Plan (in shares)				1,000
Common shares issued - Employee Stock Purchase Plan (in shares)				37,000
Common shares issued - Employee Stock Purchase Plan	0.2			$ 0.3		(0.1)
Ending Balance (in shares) at Jun. 27, 2020				160,019,000
Ending Balance at Jun. 27, 2020	$ 1,348.2			$ 1,263.3		75.2		99.7		(90.0)
Beginning Balance (in shares) at Jan. 02, 2021	160,406,464			160,406,000
Beginning Balance at Jan. 02, 2021	$ 1,346.9			$ 1,268.0		84.5		81.1		(86.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(18.5)							(18.5)
Other comprehensive income (loss), net of tax	8.5									8.5
Common shares dividends	(19.5)							(19.5)
Share-based compensation	6.2					6.2
Common shares repurchased and canceled (in shares)				(982,000)
Common shares repurchased and canceled	(16.3)			$ (9.6)				(6.7)
Common shares issued - Equity Incentive Plan (in shares)					2,119,000
Common shares issued - Equity Incentive Plan		17.8			$ 28.3		(10.5)
Common shares issued - Dividend Reinvestment Plan (in shares)				1,000
Common shares issued - Employee Stock Purchase Plan (in shares)				60,000
Common shares issued - Employee Stock Purchase Plan	$ 0.9			$ 1.0		(0.1)
Ending Balance (in shares) at Jul. 03, 2021	161,604,393			161,604,000
Ending Balance at Jul. 03, 2021	$ 1,326.0			$ 1,287.7		80.1		36.4		(78.2)
Beginning Balance (in shares) at Apr. 03, 2021				160,818,000
Beginning Balance at Apr. 03, 2021	1,336.7			$ 1,274.2		81.6		61.1		(80.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(8.3)							(8.3)
Other comprehensive income (loss), net of tax	2.0									2.0
Common shares dividends	(9.7)							(9.7)
Share-based compensation	3.8					3.8
Common shares repurchased and canceled (in shares)				(803,000)
Common shares repurchased and canceled	(13.2)			$ (6.5)				(6.7)
Common shares issued - Equity Incentive Plan (in shares)					1,554,000
Common shares issued - Equity Incentive Plan		$ 14.2			$ 19.4		$ (5.2)
Common shares issued - Dividend Reinvestment Plan (in shares)				1,000
Common shares issued - Employee Stock Purchase Plan (in shares)				34,000
Common shares issued - Employee Stock Purchase Plan	$ 0.5			$ 0.6		(0.1)
Ending Balance (in shares) at Jul. 03, 2021	161,604,393			161,604,000
Ending Balance at Jul. 03, 2021	$ 1,326.0			$ 1,287.7		$ 80.1		$ 36.4		$ (78.2)