Earnings per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2013	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Net Income
Continuing operations		$ 18.9	$ 18.2	$ 35.0	$ 33.7
Discontinued operations			0.3		0.5
NET INCOME		18.9	18.5	35.0	34.2
Shares
Shares		35,500,000	36,500,000	35,500,000	36,700,000
Per Share Amount
Continuing operations (in dollars per share)		$ 0.53	$ 0.50	$ 0.99	$ 0.92
Discontinued operations (in dollars per share)			$ 0.01		$ 0.01
Net income (in dollars per share)		$ 0.53	$ 0.51	$ 0.99	$ 0.93
Dilutive securities, principally common stock options
Shares		100,000	100,000	100,000	100,000
Net Income
Continuing operations		18.9	18.2	35.0	33.7
Discontinued operations			0.3		0.5
Net income		18.9	18.5	35.0	34.2
Weighted average number of shares:
Weighted average number of shares		35,600,000	36,600,000	35,600,000	36,800,000
Per Share Amount
Continuing operations (in dollars per share)		$ 0.53	$ 0.50	$ 0.98	$ 0.92
Discontinued operations (in dollars per share)			$ 0.01		$ 0.01
Net income (in dollars per share)		$ 0.53	$ 0.51	$ 0.98	$ 0.93
Securities not included in the computation of diluted EPS
Options to purchase shares of Class A Common Stock		400,000	400,000	400,000	400,000
Value of the entity's Class A Common Stock authorized to be repurchased	90
Number of shares of Class A common stock repurchased		213,000
Cost of shares of Class A common stock repurchased		$ 10.0