Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock Capital Stock, Class A common stock	Common Stock Capital Stock, Class B common stock	Treasury Stock Treasury Stock, Class A common stock	Treasury Stock Treasury Stock, Class B common stock	Paid-in Capital	Earnings Invested in the Business	Accumulated Other Comprehensive Income
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures				$ 0.7	$ 0.0	$ 3.0
Beginning balance at Dec. 29, 2013		$ 36.6	$ 3.5	(55.6)	(0.6)	26.0	$ 751.3	$ 61.4
Increase (Decrease) in Stockholders' Equity
Net earnings	$ 5.3						5.3
Dividends							(3.8)
Other comprehensive income, net of tax	12.7							12.7
Ending balance at Jun. 29, 2014	840.5	36.6	3.5	(54.9)	(0.6)	29.0	752.8	74.1
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures				0.5	0.0	1.5
Beginning balance at Mar. 30, 2014		36.6	3.5	(55.4)	(0.6)	27.5	751.9	61.7
Increase (Decrease) in Stockholders' Equity
Net earnings	2.8						2.8
Dividends							(1.9)
Other comprehensive income, net of tax	12.4							12.4
Ending balance at Jun. 29, 2014	840.5	36.6	3.5	(54.9)	(0.6)	29.0	752.8	74.1
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures				0.8	0.0	2.6
Beginning balance at Dec. 28, 2014	833.7	36.6	3.5	(49.2)	(0.6)	24.9	767.4	51.1
Increase (Decrease) in Stockholders' Equity
Net earnings	10.5						10.5
Dividends							(3.8)
Other comprehensive income, net of tax	0.7							0.7
Ending balance at Jun. 28, 2015	844.5	36.6	3.5	(48.4)	(0.6)	27.5	774.1	51.8
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures				0.7	0.0	1.6
Beginning balance at Mar. 29, 2015		36.6	3.5	(49.1)	(0.6)	25.9	769.2	45.6
Increase (Decrease) in Stockholders' Equity
Net earnings	6.8						6.8
Dividends							(1.9)
Other comprehensive income, net of tax	6.2							6.2
Ending balance at Jun. 28, 2015	$ 844.5	$ 36.6	$ 3.5	$ (48.4)	$ (0.6)	$ 27.5	$ 774.1	$ 51.8