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Accounting Policies - Stock-Based Compensation (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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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 |  |

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