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Stock-Based Compensation Programs (Details) | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2015 shares | Jan. 31, 2014 shares | Jun. 30, 2015 installment $ / shares | Dec. 31, 2014 $ / shares
Stock option and SSARs |  |  |  |
Stock-Based Compensation Programs |  |  |  |
Number of equal installments commencing one year from the date of grant | installment |  |  | 4 |
Vesting period |  |  | 1 year |
Expiration period of options |  |  | 10 years |
Granted (in shares) | 1,231,865 |  |  |
Weighted average fair value at grant date (in dollars per share) | $ / shares |  |  | $ 14.20 | $ 9.81
Weighted average assumptions used in estimation of fair values of options |  |  |  |
Expected dividend yield (as a percent) | 0.79% | 1.06% |  |
Expected stock price volatility (as a percent) | 22.11% | 21.41% |  |
Risk-free interest rate (as a percent) | 1.39% | 1.65% |  |
Expected life of options | 5 years 10 months 6 days | 5 years 6 months |  |
PCEQs |  |  |  |
Stock-Based Compensation Programs |  |  |  |
Vesting period |  |  | 3 years |
Granted (in shares) | 116,559 | 143,305 |  |
PCEQs | Minimum |  |  |  |
Weighted average assumptions used in estimation of fair values of options |  |  |  |
Vest range of participant's assigned award opportunity (as a percent) | 0.00% | 0.00% |  |
PCEQs | Maximum |  |  |  |
Weighted average assumptions used in estimation of fair values of options |  |  |  |
Vest range of participant's assigned award opportunity (as a percent) | 200.00% | 200.00% |  |

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- Definition Represents the vest percent of participant's assigned award opportunity during the reporting period. + References No definition available. + Details
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- Definition Represents the number of equal installments commencing one year from date of grant over which the stock options vest. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options and stock-settled appreciation rights granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition The quantity of shares issuable on stock options and stock-settled appreciation rights granted during the reporting period. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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=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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -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 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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