Consolidated Statements of Equity - USD ($) $ in Millions	Total	Equity Incentive Plan	Common Shares	Common Shares Equity Incentive Plan	Additional Paid-in-Capital	Additional Paid-in-Capital Equity Incentive Plan	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 29, 2018			136,195,000
Beginning Balance at Dec. 29, 2018	$ 1,170.4		$ 899.4		$ 73.9		$ 298.8	$ (101.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(19.7)						(19.7)
Other comprehensive income (loss), net of tax	5.1							5.1
Common shares dividends ($0.06 per common share)	(8.2)						(8.2)
Share-based compensation	3.5				3.5
Common shares repurchased and canceled (in shares)			(770,000)
Common shares repurchased and canceled	(11.0)		$ (6.9)				(4.1)
Common shares issued - Equity Incentive Plan (in shares)			519,000
Common shares issued - Equity Incentive Plan	0.0		$ 6.1		(6.1)
Common shares issued - Employee Stock Purchase Plan (in shares)			22,000
Common shares issued - Employee Stock Purchase Plan	0.4		$ 0.4
Ending Balance (in shares) at Mar. 30, 2019			135,966,000
Ending Balance at Mar. 30, 2019	$ 1,151.0		$ 899.0		71.3		277.3	(96.6)
Beginning Balance (in shares) at Dec. 28, 2019	134,803,211		134,803,000
Beginning Balance at Dec. 28, 2019	$ 1,166.2		$ 892.3		77.4		265.0	(68.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3.5						3.5
Other comprehensive income (loss), net of tax	(29.9)							(29.9)
Common shares dividends ($0.06 per common share)	(9.6)						(9.6)
Share-based compensation	3.1				3.1
Common shares issued in connection of business combination and assumed awards, net of equity issuance costs of $1.1 million (in shares)			26,497,000
Common shares issued in connection of business combination and assumed awards, net of equity issuance costs of $1.1 million	379.4		$ 376.5		2.9
Common shares repurchased and canceled (in shares)			(2,776,000)
Common shares repurchased and canceled	(31.9)		$ (22.2)				(9.7)
Common shares issued - Equity Incentive Plan (in shares)				1,277,000
Common shares issued - Equity Incentive Plan		$ 3.9		$ 15.7		$ (11.8)
Common shares issued - Employee Stock Purchase Plan (in shares)			25,000
Common shares issued - Employee Stock Purchase Plan	$ 0.3		$ 0.4		(0.1)
Ending Balance (in shares) at Mar. 28, 2020	159,825,718		159,826,000
Ending Balance at Mar. 28, 2020	$ 1,480.7		$ 1,262.7		$ 71.5		$ 244.9	$ (98.4)