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Stock-Based Compensation (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares
Stock-based compensation expense |  |  |
Pre-tax compensation expense | $ 17.4 | $ 15.7 | $ 17.0
Pre-tax compensation expense related to discontinued operations |  |  | 0.9
The amount of financing cash flows of excess income tax benefits related to share-based compensation expense | $ 15.9 | $ 13.2 | $ 5.3
Executive Incentive Program |  |  |
Stock-based compensation |  |  |
Shares available for grant under the plan | shares | 4,460,142 |  |
Shares available for issuance under the plan | shares | 1,604,716 |  |
Stock options |  |  |
Stock-based compensation |  |  |
Stock options granted (in shares) | shares | 316,345 | 259,035 | 283,975
Awards granted (in shares) | shares | 316,345 |  |
Portion of stock options vesting on the first anniversary | 0.3333 |  |
Portion of stock options vesting on the second anniversary | 0.3333 |  |
Portion of stock options vesting on the third anniversary | 0.3333 |  |
Maximum term life | 10 years |  |
Stock-based compensation expense |  |  |
Pre-tax compensation expense | $ 5.1 | $ 4.5 | $ 4.9
After-tax compensation expense | $ 3.2 | $ 2.8 | $ 3.0
Impact on diluted EPS (in dollars per share) | $ / shares | $ 0.05 | $ 0.04 | $ 0.05
Unrecognized compensation cost related to stock options | $ 3.7 |  |
Weighted average period of recognition of unrecognized compensation cost related to stock options | 1 year 11 months 12 days |  |
Weighted-average assumptions used to estimate grant date fair value of stock options |  |  |
Expected dividend yield (as a percent) | 1.10% | 1.20% | 1.20%
Expected life in years | 5 years 8 months 16 days | 5 years 8 months 27 days | 5 years 8 months 16 days
Expected volatility (as a percent) | 27.30% | 29.30% | 32.20%
Risk-free interest rate (as a percent) | 1.40% | 1.70% | 1.00%
Weighted average fair value (in dollars per share) | $ / shares | $ 21.19 | $ 19.15 | $ 17.58
Restricted stock awards |  |  |
Stock-based compensation |  |  |
Awards granted (in shares) | shares | 58,040 | 104,773 | 71,255
Stock-based compensation expense |  |  |
Pre-tax compensation expense | $ 5.9 | $ 5.1 | $ 4.6
Unrecognized compensation cost related to stock options | $ 4.3 |  |
Weighted average period of recognition of unrecognized compensation cost related to stock options | 1 year 6 months 29 days |  |
Performance share awards |  |  |
Stock-based compensation |  |  |
Awards granted (in shares) | shares | 58,040 | 67,970 | 71,255
Stock-based compensation expense |  |  |
Pre-tax compensation expense | $ 6.3 | $ 6.0 | $ 6.5
Unrecognized compensation cost related to stock options | $ 3.7 |  |
Weighted average period of recognition of unrecognized compensation cost related to stock options | 1 year 8 months 1 day |  |
Restricted Stock Units |  |  |
Stock-based compensation |  |  |
Awards granted (in shares) | shares | 12,157 |  |
Aggregate grant-date fair value of stock options, restricted stock awards, performance share awards and restricted stock units | $ 19.7 |  |

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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=6415400&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=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 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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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