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Stock-Based Compensation Plans Stock-Based Compensation Plans (Details 3) - Performance Shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 $ / shares | Jun. 30, 2017 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Dividend yield (as a percent) |  | 3.20%
Estimated volatility, Minimum (as a percent) | 15.30% |
Estimated volatility, Maximum (as a percent) | 19.70% |
Risk-free interest rate, minimum (as a percent) | 0.69% |
Risk-free interest rate, maximum (as a percent) | 1.61% |
Average estimated fair value (in dollars per share) | $ 175.86 | $ 175.86
Historical volatility (as a percent) |  | 50.00%
Implied volatility (as a percent) |  | 50.00%

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- Definition The implied volatility rate used in valuation technique of calculation of fair value of awards. + References No definition available. + Details
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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + 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 maximum 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 No definition available. + Details
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- Definition The estimated measure of the minimum 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 No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + 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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- Details
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