Share-Based Payments Weighted Average Assumptions (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.69%	2.04%
Expected dividend yield	0.00%	0.00%
Estimated volatility	81.45%	88.71%
Expected term (years)	1 year 9 months	2 years 9 months
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.46%	2.65%	2.04%
Expected dividend yield	4.16%	2.08%	1.64%
Weighted-average volatility (as a percent)	24.48%	22.81%	22.52%
Expected term (years)	5 years 3 months 18 days	5 years 3 months 18 days	5 years 1 month 6 days
Granted, weighted-average grant date fair value (in dollars per unit)	$ 9.20	$ 15.44	$ 18.66
Stock options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated volatility	24.46%	22.36%	22.40%
Stock options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated volatility	24.60%	24.14%	22.88%
Performance shares (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.49%	2.34%	1.59%
Expected dividend yield	4.17%	2.08%	1.64%
Weighted-average volatility (as a percent)	24.97%	22.76%	24.24%
Expected term (years)	2 years 9 months 18 days	2 years 9 months 18 days	2 years 9 months 18 days
Granted, weighted-average grant date fair value (in dollars per unit)	$ 53.31	$ 78.30	$ 97.13
Performance shares (PSUs) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated volatility	13.82%	13.03%	13.71%
Performance shares (PSUs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated volatility	42.46%	81.87%	80.59%

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).

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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.

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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.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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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.

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No definition available.

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- Definition

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.

+ 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)(i)
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-Publisher FASB
-Name Accounting Standards Codification
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