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Share-Based Compensation (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Feb. 22, 2018 shares | Jan. 01, 2018 USD ($) Percentile_Rank employee $ / shares shares | Mar. 31, 2018 USD ($) $ / shares shares
Restricted shares |  |  |
Share-Based Compensation |  |  |
Stock awards granted (in shares or units) | shares |  |  | 181,617
Aggregate grant date fair value | $ |  |  | $ 4.6
Assumptions used to value stock awards |  |  |
Weighted average grant date fair value (in dollars per share) | $ / shares |  |  | $ 25.18
Other Share-based Compensation Additional Disclosures |  |  |
Shares vested (in shares) | shares |  |  | 134,460
Weighted average fair value of shares vested (in dollars per share) | $ / shares |  |  | $ 29.49
Aggregate intrinsic value of awards upon vesting | $ |  |  | $ 3.4
2018 PSU Grants | Performance share units |  |  |
Share-Based Compensation |  |  |
Stock awards granted (in shares or units) | shares |  | 59,110 |
Aggregate grant date fair value | $ |  | $ 1.9 |
Potential earned PSUs payout for defined levels of performance under awards |  |  |
Earned PSUs payout (as a percent of PSUs granted) on 75th or greater percentile rank |  | 200.00% |
Earned PSUs payout (as a percent of PSUs granted) on 50th percentile rank |  | 100.00% |
Earned PSUs payout (as a percent of PSUs granted) on 25th percentile rank |  | 50.00% |
Performance share units granted on percentile rank below 25th (as a percent) |  | 0.00% |
The number of percentile ranks to fall between to earn interpolated PSUs between such percentile ranks, conditioned on the percentile rank exceeding 25% | Percentile_Rank |  | 2 |
Assumptions used to value stock awards |  |  |
Performance period of the award |  | 3 years |
Weighted average grant date fair value (in dollars per share) | $ / shares |  | $ 31.97 |
Baseline value per common share (in dollars per share) | $ / shares |  | $ 29.20 |
Expected volatility of common shares (as a percent) |  | 17.00% |
Risk-free interest rate (as a percent) |  | 2.04% |
2018 PSU Grants | Performance share units | Executives |  |  |
Share-Based Compensation |  |  |
Number of employees affected | employee |  | 3 |
2015 PSU Grants | Performance share units | Executives |  |  |
Other Share-based Compensation Additional Disclosures |  |  |
Shares issued (in shares) | shares | 13,328 |  |
Percentage of target | 75.00% |  |

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- Definition The number of percentile ranks to fall between to earn interpolated PSUs between such percentile ranks, conditioned on the percentile rank exceeding 25%. + References No definition available. + Details
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- Definition The aggregate fair value at grant date for nonvested equity-based awards issued 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 No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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)(1) -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 weighted average fair value at grant date for nonvested equity-based awards issued 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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -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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