Stock-Based Compensation Plans Stock-Based Compensation Plans (Details 3) - Performance Shares	6 Months Ended
Jun. 30, 2018 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield (as a percent)	3.70%
Estimated volatility, Minimum (as a percent)	11.80%
Estimated volatility, Maximum (as a percent)	18.70%
Risk-free interest rate, minimum (as a percent)	1.86%
Risk-free interest rate, maximum (as a percent)	2.46%
Average estimated fair value (in dollars per share)	$ 151.67
Historical volatility (as a percent)	50.00%
Implied volatility (as a percent)	50.00%

The historical volatility rate used in valuation technique of calculation of fair value of awards.

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&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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