Earnings per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Apr. 30, 2013	Mar. 31, 2013	Apr. 01, 2012
Net Income
Continuing operations		$ 16.1	$ 15.5
Discontinued operations			0.2
Net income		16.1	15.7
Shares
Shares		35.5	36.9
Per Share Amount
Continuing operations (in dollars per share)		$ 0.45	$ 0.42
Net income (in dollars per share)		$ 0.45	$ 0.42
Dilutive securities, principally common stock options
Shares		0.1	0.1
Net Income
Continuing operations		16.1	15.5
Discontinued operations			0.2
Net income		16.1	15.7
Weighted average number of shares:
Weighted average number of shares		35.6	37.0
Per Share Amount
Continuing operations (in dollars per share)		$ 0.45	$ 0.42
Net income (in dollars per share)		$ 0.45	$ 0.42
Securities not included in the computation of diluted EPS
Options to purchase shares of Class A Common Stock		0.4	0.3
Value of the entity's Class A Common Stock authorized to be repurchased	$ 90