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Accounting Policies (Details 3) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2014 | Jun. 30, 2013 | Jun. 29, 2014 item | Jun. 30, 2013
Stock-based compensation |  |  |  |
Number of stock incentive plans |  |  | 1 |
Shipping and Handling |  |  |  |
Shipping and handling costs included in selling, general and administrative expense | $ 15.8 | $ 15.8 | $ 30.5 | $ 29.7
Research and Development |  |  |  |
Research and development costs included in selling, general, and administrative expense | $ 5.6 | $ 5.5 | $ 11.9 | $ 10.9
Nonqualified stock options | Class A |  |  |  |
Stock-based compensation |  |  |  |
Minimum exercise price as percentage of fair market value of common stock on grant date |  |  | 100.00% |
2004 Stock Incentive Plan | Stock options |  |  |  |
Stock-based compensation |  |  |  |
Vesting period |  |  | 4 years |
Percentage of stock options becoming exercisable |  |  | 25.00% |
Expiration period |  |  | 10 years |
Awards issued during the period (in shares) |  |  | 4,808 | 9,500
2004 Stock Incentive Plan | Stock options | Granted in 2014 |  |  |  |
Stock-based compensation |  |  |  |
Vesting period |  |  | 3 years |
Percentage of stock options becoming exercisable |  |  | 33.00% |
2004 Stock Incentive Plan | Restricted stock |  |  |  |
Stock-based compensation |  |  |  |
Vesting period |  |  | 2 years |
Awards issued during the period (in shares) |  |  | 41,885 | 3,167
2004 Stock Incentive Plan | Restricted stock | Granted in 2014 |  |  |  |
Stock-based compensation |  |  |  |
Vesting period |  |  | 2 years |
Percentage of stock options becoming exercisable |  |  | 50.00% |
2004 Stock Incentive Plan | Performance stock units |  |  |  |
Stock-based compensation |  |  |  |
Vesting period |  |  | 3 years |
Performance period of revenue to measure compound annual growth rate |  |  | 3 years |
Awards issued during the period (in shares) | 20,069 |  |  |
2004 Stock Incentive Plan | Performance stock units | Class A | Minimum |  |  |  |
Stock-based compensation |  |  |  |
Percentage of target number of shares that may be earned by recipient |  |  | 0.00% |
2004 Stock Incentive Plan | Performance stock units | Class A | Maximum |  |  |  |
Stock-based compensation |  |  |  |
Percentage of target number of shares that may be earned by recipient |  |  | 200.00% |
2004 Stock Incentive Plan | Deferred shares |  |  |  |
Stock-based compensation |  |  |  |
Vesting rate per year for maximum vesting period |  |  | 0.33 |
2004 Stock Incentive Plan | Deferred shares | Maximum |  |  |  |
Stock-based compensation |  |  |  |
Vesting period |  |  | 3 years |
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) |  |  | 30,561 | 44,777
Fair value assumptions |  |  |  |
Expected life |  |  | 3 years | 3 years
Expected stock price volatility (as a percent) |  |  | 31.20% | 34.10%
Expected dividend yield (as a percent) |  |  | 0.90% | 0.90%
Risk-free interest rate (as a percent) |  |  | 0.70% | 0.40%
Weighted average grant-date fair value (in dollars per share) |  |  | $ 22.57 | $ 18.05
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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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number shares or portion of an award that are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale, for awards vesting over the maximum vesting period. Vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + References No definition available. + Details
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