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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%

X

- 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.

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