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Stock-Based Plans - Narrative (Details) - Executives - $ / shares | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Restricted stock units |  |
Stock-Based Plans |  |
Granted (in shares) |  | 874,629
Granted, weighted average grant date fair value (in dollars per share) |  | $ 38.30
Post-vest holding period ( in years ) |  | 3 years
Vesting period ( in years ) |  | 3 years
Stock-based VDI units |  |
Stock-Based Plans |  |
Granted (in shares) |  | 350,532
Vesting period ( in years ) | 3 years |
Stock-based VDI units | 2019 VDI Plan |  |
Stock-Based Plans |  |
Post-vest holding period ( in years ) | 3 years |
Expected amount of shares granted (in shares) | 116,844 |
Expected weighted average grant date fair value (in dollars per share) | $ 39.72 |
Stock-based VDI units | 2018 VDI Plan |  |
Stock-Based Plans |  |
Expected amount of shares granted (in shares) | 68,866 |
Expected weighted average grant date fair value (in dollars per share) | $ 42.24 |
Stock-based VDI units | 2017 VDI Plan |  |
Stock-Based Plans |  |
Expected amount of shares granted (in shares) | 72,601 |
Expected weighted average grant date fair value (in dollars per share) | $ 35.18 |

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- Definition Represents the required holding period after an employee has met the vesting criteria of a share-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The expected number of grants made 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). + References No definition available. + Details
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- Definition The expected 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). + References No definition available. + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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