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Stock-based compensation Stock-based compensation (Summary of Stock Options) (Details) - Share-based Payment Arrangement, Option [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of our common stock on grant date (in usd per share)	$ 177.31	$ 177.46	$ 162.60
Volatility	23.50%	24.60%	22.70%
Expected life (in years)	5 years 9 months 18 days	5 years 9 months 18 days	5 years 9 months 18 days
Risk-free interest rate	2.40%	2.80%	2.10%
Expected dividend yield	3.10%	2.90%	2.80%
Granted (in usd per share)	$ 30.47	$ 34.60	$ 27.54

X

- Definition

The closing price of our common stock on grant date used to estimate the grant date fair value of our stock-based compensation.

+ References

No definition available.

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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

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-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=116856206&loc=d3e5070-113901

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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

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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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.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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