Earnings per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2013	Jul. 31, 2012	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012	May 16, 2012
Net Income
Continuing operations			$ 17.5	$ 18.3	$ 52.7	$ 52.2
Discontinued operations			(2.1)	0.4	(2.3)	0.7
NET INCOME			15.4	18.7	50.4	52.9
Shares
Shares			35,400,000	35,100,000	35,500,000	36,100,000
Per Share Amount
Continuing operations (in dollars per share)			$ 0.49	$ 0.52	$ 1.48	$ 1.44
Discontinued operations (in dollars per share)			$ (0.06)	$ 0.01	$ (0.06)	$ 0.02
NET INCOME (in dollars per share)			$ 0.43	$ 0.53	$ 1.42	$ 1.46
Dilutive securities, principally common stock options
Common stock equivalents			200,000	100,000	100,000	200,000
Net Income
Continuing operations			17.5	18.3	52.7	52.2
(Loss) income from discontinued operations, net of tax			(2.1)	0.4	(2.3)	0.7
Net income			15.4	18.7	50.4	52.9
Weighted average number of shares:
Weighted average number of shares			35,600,000	35,200,000	35,600,000	36,300,000
Per Share Amount
Continuing operations (in dollars per share)			$ 0.49	$ 0.52	$ 1.48	$ 1.44
Discontinued operations (in dollars per share)			$ (0.06)	$ 0.01	$ (0.07)	$ 0.02
Net income (in dollars per share)			$ 0.43	$ 0.53	$ 1.41	$ 1.46
Securities not included in the computation of diluted EPS
Options to purchase shares of Class A common stock			200,000	300,000	300,000	300,000
Options to purchase shares of Class A common stock	90
Number of shares of Class A common stock repurchased		2,000,000	189,000		402,000
Cost of shares of Class A common stock repurchased		$ 65.8	$ 10.0		$ 20.0
Number of shares of the entity's Class A common stock authorized to be repurchased							2,000,000