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	Retained Earnings Equity Incentive Plan	Accumulated Other Comprehensive Loss	Non- Controlling Interests
Balance (in shares) at Dec. 30, 2017			139,489,000
Balance at Dec. 30, 2017	$ 885.7		$ 917.1		$ 69.1		$ (12.2)		$ (94.4)	$ 6.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	382.8						382.2			0.6
Total other comprehensive income	3.3								3.3
Common shares dividends	(25.5)						(25.5)
Share-based compensation	14.6				14.6
Common shares repurchased and canceled (in shares)				(2,930,000)
Common shares repurchased and canceled		$ (46.1)		$ (22.8)				$ (23.3)
Common shares issued - Equity Incentive Plan (in shares)				1,462,000
Common shares issued - Equity Incentive Plan		4.9		$ 15.8		$ (10.9)
Common shares issued - Dividend Reinvestment Plan (in shares)			17,000
Common shares issued - Dividend Reinvestment Plan	0.2		$ 0.2
Common shares issued - Employee Stock Purchase Plan (in shares)			68,000
Common shares issued - Employee Stock Purchase Plan	0.9		$ 1.0		(0.1)
Distributions to non-controlling interests	(0.9)									(0.9)
Sale of subsidiary shares of non-controlling interests	(5.8)									(5.8)
Balance (in shares) at Sep. 29, 2018			138,106,000
Balance at Sep. 29, 2018	1,214.1		$ 911.3		72.7		321.2		(91.1)	0.0
Balance (in shares) at Jun. 30, 2018			139,435,000
Balance at Jun. 30, 2018	1,228.6		$ 918.4		67.3		333.4		(90.5)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	10.0						10.0
Total other comprehensive income	(0.6)								(0.6)
Common shares dividends	(8.3)						(8.3)
Share-based compensation	6.8				6.8
Common shares repurchased and canceled (in shares)				(1,574,000)
Common shares repurchased and canceled		(24.4)		$ (10.5)				$ (13.9)
Common shares issued - Equity Incentive Plan (in shares)				221,000
Common shares issued - Equity Incentive Plan		1.6		$ 3.0		(1.4)
Common shares issued - Dividend Reinvestment Plan (in shares)			3,000
Common shares issued - Dividend Reinvestment Plan	0.1		$ 0.1
Common shares issued - Employee Stock Purchase Plan (in shares)			21,000
Common shares issued - Employee Stock Purchase Plan	0.3		$ 0.3		0.0
Balance (in shares) at Sep. 29, 2018			138,106,000
Balance at Sep. 29, 2018	$ 1,214.1		$ 911.3		72.7		321.2		(91.1)	0.0
Balance (in shares) at Dec. 29, 2018	136,195,108		136,195,000
Balance at Dec. 29, 2018	$ 1,170.4		$ 899.4		73.9		298.8		(101.7)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of changes in accounting principle, net of taxes	10.5
Net income (loss)	(5.2)						(5.2)
Total other comprehensive income	12.3								12.3
Common shares dividends	(24.5)						(24.5)
Share-based compensation	8.5				8.5
Common shares repurchased and canceled (in shares)			(2,215,000)
Common shares repurchased and canceled	(31.1)		$ (16.5)				(14.6)
Common shares issued - Equity Incentive Plan (in shares)				618,000
Common shares issued - Equity Incentive Plan		$ 0.0		$ 6.5		$ (6.5)
Common shares issued - Dividend Reinvestment Plan (in shares)			3,000
Common shares issued - Dividend Reinvestment Plan	0.0		$ 0.0
Common shares issued - Employee Stock Purchase Plan (in shares)			70,000
Common shares issued - Employee Stock Purchase Plan	$ 1.0		$ 1.1		(0.1)
Balance (in shares) at Sep. 28, 2019	134,670,538		134,671,000
Balance at Sep. 28, 2019	$ 1,141.9		$ 890.5		75.8		265.0		(89.4)	0.0
Balance (in shares) at Jun. 29, 2019			134,638,000
Balance at Jun. 29, 2019	1,139.9		$ 890.0		74.4		263.1		(87.6)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	10.1						10.1
Total other comprehensive income	(1.8)								(1.8)
Common shares dividends	(8.2)						(8.2)
Share-based compensation	1.7				1.7
Common shares repurchased and canceled (in shares)			(4,000)
Common shares repurchased and canceled	(0.1)		$ (0.1)				0.0
Common shares issued - Equity Incentive Plan (in shares)			13,000
Common shares issued - Equity Incentive Plan	0.0		$ 0.2		(0.2)
Common shares issued - Employee Stock Purchase Plan (in shares)			24,000
Common shares issued - Employee Stock Purchase Plan	$ 0.3		$ 0.4		(0.1)
Balance (in shares) at Sep. 28, 2019	134,670,538		134,671,000
Balance at Sep. 28, 2019	$ 1,141.9		$ 890.5		$ 75.8		$ 265.0		$ (89.4)	$ 0.0