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Stock-Based Compensation - Stock Award Information and Fair Value Assumptions (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock-based compensation expense |  |  |
Pre-tax compensation expense | $ 20.7 | $ 16.5 | $ 18.4
Income tax benefit | $ 12.5 |  |
Executive Incentive Program |  |  |
Stock-based compensation |  |  |
Shares available for grant under the plan (in shares) | 4,200,000 |  |
Shares available for issuance under the plan (in shares) | 3,300,000 |  |
Stock options |  |  |
Stock-based compensation |  |  |
Awards granted (in shares) | 364,675 |  |
Stock-based compensation expense |  |  |
Pre-tax compensation expense | $ 7.7 | $ 6.1 | $ 5.1
Vesting period | 3 years |  |
Maximum term life | 10 years |  |
Unrecognized compensation cost related to stock options | $ 5.1 |  |
Weighted average period of recognition of unrecognized compensation cost related to stock options | 1 year 10 months 13 days |  |
Weighted-average assumptions used to estimate grant date fair value of stock options |  |  |
Expected dividend yield (as a percent) | 1.30% | 1.40% | 1.10%
Expected life in years | 5 years 6 months 29 days | 5 years 7 months 9 days | 5 years 8 months 15 days
Expected volatility (as a percent) | 25.60% | 27.50% | 27.30%
Risk-free interest rate (as a percent) | 1.90% | 1.40% | 1.40%
Weighted average grant date fair value (in dollars per share) | $ 24.57 | $ 19.30 | $ 21.19
Fair value of options granted | $ 8.8 | $ 7.2 | $ 6.7
Intrinsic value of options exercised | 8.5 | 56.4 | 42.7
Fair value of options vested | $ 5.4 | 4.7 | 4.6
Restricted stock awards |  |  |
Stock-based compensation |  |  |
Awards granted (in shares) | 91,098 |  |
Stock-based compensation expense |  |  |
Pre-tax compensation expense | $ 6.0 | 4.5 | 5.9
Vesting period | 3 years |  |
Unrecognized compensation cost related to stock options | $ 9.0 |  |
Weighted average period of recognition of unrecognized compensation cost related to stock options | 2 years 1 month 6 days |  |
Performance share awards |  |  |
Stock-based compensation |  |  |
Awards granted (in shares) | 47,285 |  |
Stock-based compensation expense |  |  |
Pre-tax compensation expense | $ 5.6 | $ 4.7 | $ 6.3
Vesting period | 3 years |  |
Unrecognized compensation cost related to stock options | $ 6.7 |  |
Weighted average period of recognition of unrecognized compensation cost related to stock options | 1 year 7 months 28 days |  |
Performance share awards | 2016 Awards |  |  |
Stock-based compensation |  |  |
Awards granted (in shares) | 47,285 |  |
Restricted Stock Units |  |  |
Stock-based compensation |  |  |
Awards granted (in shares) | 13,399 | 14,359 | 12,157
Stock-based compensation expense |  |  |
Pre-tax compensation expense | $ 1.4 | $ 1.2 | $ 1.1
Weighted-average assumptions used to estimate grant date fair value of stock options |  |  |
Fair value of options granted | $ 26.8 |  |

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- Definition Represents the aggregate grant-date fair value of share-based compensation plan awards to be expensed over the requisite period. + References No definition available. + Details
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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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 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=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901 + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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