Accounting Policies - Stock-Based Compensation (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) item $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares
Fair value assumptions
Number of stock-based compensation plans | item	1
Total unrecognized compensation costs related to unvested stock-based compensation arrangements	$ 16.2
Total weighted average remaining term of unrecognized compensation costs	1 year 7 months 13 days
Compensation cost recognized	$ 13.4	$ 10.9	$ 8.6
Impact on both basic and diluted net income per common share for recognition of total stock-based compensation expense (in dollars per share) | $ / shares	$ 0.29	$ 0.25	$ 0.10
Shipping and Handling
Shipping and handling costs included in selling, general and administrative expense	$ 47.9	$ 53.5	$ 61.8
Research and Development
Research and development costs included in selling, general, and administrative expense	26.5	23.5	22.5
Stock options
Fair value assumptions
Tax benefit recorded for the compensation expense	$ 0.8	$ 0.3	$ 0.7
Performance stock units
Stock-based compensation
Granted (in shares) | shares	107,000	106,000
Fair value assumptions
Weighted average grant-date fair value (in dollars per share) | $ / shares	$ 55.27	$ 58.94
Total unrecognized compensation costs related to unvested stock-based compensation arrangements	$ 6.3
Total weighted average remaining term of unrecognized compensation costs	1 year 6 months 11 days
Compensation cost recognized	$ 4.0	$ 1.7
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
Percentage of stock options becoming exercisable	25.00%
Expiration period (years)	10 years
Fair value assumptions
Expected life (years)			6 years
Expected stock price volatility (as a percent)			37.50%
Expected dividend yield (as a percent)			1.00%
Risk-free interest rate (as a percent)			1.90%
Total unrecognized compensation costs related to unvested stock-based compensation arrangements	$ 0.6
Total weighted average remaining term of unrecognized compensation costs	7 months 6 days
Compensation cost recognized	$ 1.1	$ 1.9	$ 2.6
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 | Maximum
Stock-based compensation
Vesting period	3 years
Vesting rate per year for maximum vesting period	0.33
Second Amended and Restated 2004 Stock Incentive Plan | Deferred shares
Stock-based compensation
Vesting period	3 years
Vesting rate per year for maximum vesting period	0.33
Management Stock Purchase Plan | Class A
Stock-based compensation
Purchase price as percentage of fair market value of common stock on grant date	67.00%
Shares authorized | shares	2,000,000
Management Stock Purchase Plan | Restricted stock units (RSUs)
Stock-based compensation
Granted (in shares) | shares	89,000	60,000	31,000
Fair value assumptions
Expected life (years)	3 years	3 years	3 years
Expected stock price volatility (as a percent)	24.80%	23.40%	31.20%
Expected dividend yield (as a percent)	1.30%	1.20%	0.90%
Risk-free interest rate (as a percent)	0.90%	1.10%	0.70%
Weighted average grant-date fair value (in dollars per share) | $ / shares	$ 18.15	$ 19.04	$ 22.57
Total unrecognized compensation costs related to unvested stock-based compensation arrangements	$ 1.5
Total weighted average remaining term of unrecognized compensation costs	1 year 9 months 18 days
Compensation cost recognized	$ 0.7	$ 0.6	$ 0.5
Management Stock Purchase Plan | Restricted stock units (RSUs) | Minimum
Stock-based compensation
Vesting period	3 years