Reward Rate Of Stock Appreciation Over Performance Period.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Dividend Rate

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- Definition

Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals.

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No definition available.

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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.

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- Definition

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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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Weighted average grant-date fair value of non-vested options outstanding.

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No definition available.

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- Definition

The average discount rate applied to insurance contracts to determine future policy benefits to be paid to or on behalf of policyholders.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 40
-Section 50
-Paragraph 5
-Subparagraph (b)
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Share-Based Compensation Plans - Narrative (Details) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized, not yet granted (in shares)		5,700,000
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation plan, stock units held (shares)		198,198	170,672
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation plan, stock units held (shares)		19,951	18,159
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
The weighted-average fair value per share at grant date		$ 78.28	$ 72.31	$ 55.85
Weighted-average discount percent		2.00%	2.00%	2.00%
Vesting period		3 years
Performance Shares Units PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized, not yet granted (in shares)	129,100		187,000.0
The weighted-average fair value per share at grant date		$ 81.48
Actual shares earned and distributed (shares)	129,100		225,900
TSR PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Performance period		3 years
Dividend yield		0.00%
Stock Options \| Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		6 years
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
The weighted-average fair value per share at grant date		$ 79.69
The weighted-average grant-date fair value (in dollars per share)		$ 79.69	$ 74.43	$ 60.80
Share-based Compensation Award, Three-year Vesting \| Internal Metric Performance Share Units (IM PSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period		3 years
Share-based Compensation Award, Additional Two-year Vesting \| Internal Metric Performance Share Units (IM PSU) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award		0.00%
Share-based Compensation Award, Additional Two-year Vesting \| Internal Metric Performance Share Units (IM PSU) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award		200.00%
Share-based Compensation Award, Current-year \| TSR PSU \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award		0.00%
Share-based Compensation Award, Current-year \| TSR PSU \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award		200.00%
Share-based Compensation Award, Prior-year \| TSR PSU \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award		0.00%
Share-based Compensation Award, Prior-year \| TSR PSU \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award		150.00%