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Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 item | Dec. 31, 2012 | Dec. 31, 2011
Stock-based compensation |  |  |
Number of stock incentive plans | 2 |  |
Total unrecognized compensation cost related to the unvested awards | $ 20.8 |  |
Total weighted average remaining term of unrecognized compensation costs | 2 years 6 months |  |
Compensation cost recognized | 9.6 | 5.8 | 5.3
ISOs | Class A common stock |  |  |
Stock-based compensation |  |  |
Minimum exercise price as percentage of fair market value of common stock on grant date | 100.00% |  |
NSOs | Class A common stock |  |  |
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 |  |  |
Stock-based compensation |  |  |
Number of stock-based compensation plans available for grant of new equity awards | 1 |  |
Second Amended and Restated 2004 Stock Incentive Plan | Class A common stock |  |  |
Stock-based compensation |  |  |
Shares authorized | 1,650,400 |  |
Second Amended and Restated 2004 Stock Incentive Plan | Stock options |  |  |
Stock-based compensation |  |  |
Vesting period, if not immediate | 4 years |  |
Percentage of stock options becoming exercisable | 25.00% |  |
Expiration period | 10 years |  |
Total unrecognized compensation cost related to the unvested awards | 10.6 |  |
Total weighted average remaining term of unrecognized compensation costs | 2 years 10 months 24 days |  |
Additional stock compensation expense |  | 0.6 | 2.2
Summary of stock option activity and related information |  |  |
Outstanding at beginning of year (in shares) | 1,064,000 | 1,272,000 | 1,303,000
Granted (in shares) | 379,000 | 415,000 | 295,000
Cancelled/Forfeitures (in shares) | (53,000) | (33,000) | (78,000)
Exercised (in shares) | (361,000) | (590,000) | (248,000)
Outstanding at end of year (in shares) | 1,029,000 | 1,064,000 | 1,272,000
Exercisable at end of year (in shares) | 249,000 | 360,000 | 745,000
Weighted Average Exercise Price |  |  |
Outstanding at beginning of year (in dollars per share) | $ 33.37 | $ 30.43 | $ 29.00
Granted (in dollars per share) | $ 54.78 | $ 37.67 | $ 29.39
Cancelled/Forfeitures (in dollars per share) | $ 36.97 | $ 31.18 | $ 30.38
Exercised (in dollars per share) | $ 31.73 | $ 30.19 | $ 21.68
Outstanding at end of year (in dollars per share) | $ 41.66 | $ 33.37 | $ 30.43
Exercisable at end of year (in dollars per share) | $ 32.35 | $ 30.91 | $ 30.61
Weighted Average Intrinsic Value |  |  |
Outstanding at end of year (in dollars per share) | $ 20.21 |  |
Exercisable at end of year (in dollars per share) | $ 29.52 |  |
Aggregate intrinsic values of exercisable options (in dollars) | 7.3 |  |
Total intrinsic value of options exercised | 7.4 | 5.7 | 3.9
Fair value assumptions |  |  |
Expected life | 6 years | 6 years | 6 years
Expected stock price volatility (as a percent) | 40.30% | 41.20% | 40.90%
Expected dividend yield (as a percent) | 1.00% | 1.20% | 1.50%
Risk-free interest rate (as a percent) | 1.70% | 0.90% | 1.60%
Estimated forfeiture rate (as a percent) | 6.75% | 6.75% | 6.75%
Weighted average grant-date fair value of stock options (in dollars per share) | $ 20.30 | $ 13.49 | $ 10.19
Second Amended and Restated 2004 Stock Incentive Plan | Stock options | Selling, general and administrative expenses |  |  |
Stock-based compensation |  |  |
Compensation cost recognized | 3.8 | 2.1 | 1.6
Second Amended and Restated 2004 Stock Incentive Plan | Stock options | Class A common stock |  |  |
Weighted Average Intrinsic Value |  |  |
Company's closing Common Stock price (in dollars per share) | $ 61.87 |  |
Second Amended and Restated 2004 Stock Incentive Plan | Restricted stock |  |  |
Stock-based compensation |  |  |
Additional stock compensation expense |  | 0.2 | 0.8
Second Amended and Restated 2004 Stock Incentive Plan | Restricted stock | Maximum |  |  |
Stock-based compensation |  |  |
Vesting period, if not immediate | 3 years |  |
Second Amended and Restated 2004 Stock Incentive Plan | Deferred shares |  |  |
Stock-based compensation |  |  |
Vesting rate per year for maximum vesting period | 0.33 |  |
Second Amended and Restated 2004 Stock Incentive Plan | Deferred shares | Maximum |  |  |
Stock-based compensation |  |  |
Vesting period, if not immediate | 3 years |  |
Management Stock Purchase Plan | Class A common stock |  |  |
Stock-based compensation |  |  |
Shares available for future grants of new equity awards | 897,029 |  |
Shares authorized | 2,000,000 |  |
Exercise price as percentage of fair market value of common stock on grant date | 67.00% |  |
Management Stock Purchase Plan | Restricted stock | Class A common stock |  |  |
Weighted Average Intrinsic Value |  |  |
Company's closing Common Stock price (in dollars per share) | $ 61.87 |  |
Management Stock Purchase Plan | Restricted stock units (RSUs) |  |  |
Stock-based compensation |  |  |
Total unrecognized compensation cost related to the unvested awards | 0.8 |  |
Total weighted average remaining term of unrecognized compensation costs | 1 year 4 months 24 days |  |
Compensation cost recognized | $ 0.7 | $ 0.8 | $ 1.3
Fair value assumptions |  |  |
Expected life | 3 years | 3 years | 3 years
Expected stock price volatility (as a percent) | 34.10% | 38.30% | 44.90%
Expected dividend yield (as a percent) | 0.90% | 1.10% | 1.20%
Risk-free interest rate (as a percent) | 0.40% | 0.40% | 1.20%
Estimated forfeiture rate (as a percent) | 6.30% | 6.30% | 6.30%
Weighted average grant-date fair value (in dollars per share) | $ 18.05 | $ 15.68 | $ 16.25
Management Stock Purchase Plan | Restricted stock units (RSUs) | Minimum |  |  |
Stock-based compensation |  |  |
Vesting period, if not immediate | 3 years |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + 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 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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Period Type: | instant

X
- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Represents the number of stock incentive plans available for the grant of new equity awards during the reporting period. + References No definition available. + Details
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Period Type: | duration

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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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- Definition Represents estimated forfeiture rate applied during the reporting period. + References No definition available. + Details
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- Definition The per share dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date. + References No definition available. + Details
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- Definition The per share dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date. + References No definition available. + Details
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- Definition Represents the number of stock incentive plans maintained by the entity. + References No definition available. + Details
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- Definition Represents the minimum purchase price expressed as a percentage of the fair market value of common stock. + References No definition available. + Details
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