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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 |  |

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