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Accounting Policies (Details 3) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 28, 2015 USD ($) shares | Jun. 29, 2014 USD ($) | Jun. 28, 2015 USD ($) item $ / shares shares | Jun. 29, 2014 USD ($) $ / shares shares | Dec. 31, 2014
Shipping and Handling |  |  |  |  |
Shipping and handling costs included in selling, general and administrative expense | $ | $ 13.8 | $ 15.8 | $ 28.2 | $ 30.5 |
Research and Development |  |  |  |  |
Research and development costs included in selling, general, and administrative expense | $ | $ 6.3 | $ 5.6 | $ 12.7 | $ 11.9 |
Second Amended and Restated 2004 Stock Incentive Plan |  |  |  |  |
Stock-based compensation |  |  |  |  |
Number of stock incentive plans | item |  |  | 1 |  |
Second Amended and Restated 2004 Stock Incentive Plan | Stock options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting period |  |  | 4 years |  | 3 years
Percentage of stock options becoming exercisable |  |  | 25.00% |  | 0.33%
Expiration period |  |  | 10 years |  |
Options granted (in shares) |  |  |  | 4,808 |
Second Amended and Restated 2004 Stock Incentive Plan | Stock options | Class A |  |  |  |  |
Stock-based compensation |  |  |  |  |
Minimum exercise price as percentage of fair market value of common stock on grant date |  |  | 100.00% |  |
Second Amended and Restated 2004 Stock Incentive Plan | Restricted stock |  |  |  |  |
Stock-based compensation |  |  |  |  |
Granted (in shares) |  |  | 60,278 | 41,885 |
Second Amended and Restated 2004 Stock Incentive Plan | Deferred shares |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rate per year for maximum vesting period |  |  | 0.33 |  | 50
Second Amended and Restated 2004 Stock Incentive Plan | Deferred shares | Maximum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting period |  |  | 3 years |  | 2 years
Second Amended and Restated 2004 Stock Incentive Plan | Performance stock units | Minimum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Number of common shares for each unit of award held |  |  | 0 |  |
Second Amended and Restated 2004 Stock Incentive Plan | Performance stock units | Maximum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Granted (in shares) |  |  | 631 |  |
Management Stock Purchase Plan | Class A |  |  |  |  |
Stock-based compensation |  |  |  |  |
Shares authorized | 2,000,000 |  | 2,000,000 |  |
Management Stock Purchase Plan | Restricted stock units (RSUs) |  |  |  |  |
Stock-based compensation |  |  |  |  |
Granted (in shares) |  |  | 59,995 | 30,561 |
Fair value assumptions |  |  |  |  |
Expected life |  |  | 3 years | 3 years |
Expected stock price volatility (as a percent) |  |  | 23.40% | 31.20% |
Expected dividend yield (as a percent) |  |  | 1.20% | 0.90% |
Risk-free interest rate (as a percent) |  |  | 1.10% | 0.70% |
Weighted average grant-date fair value (in dollars per share) | $ / shares |  |  | $ 19.04 | $ 22.57 |
Management Stock Purchase Plan | Restricted stock units (RSUs) | Minimum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting period |  |  | 3 years |  |
Management Stock Purchase Plan | Restricted stock units (RSUs) | Maximum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting period |  |  | 3 years |  |
Management Stock Purchase Plan | Restricted stock units (RSUs) | Class A |  |  |  |  |
Stock-based compensation |  |  |  |  |
Number of common shares for each unit of award held |  |  | 1 |  |
Exercise price as percentage of fair market value of common stock on grant date |  |  | 67.00% |  |

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