Share-based Compensation Arrangement by Share-based Payment Award, Awards Earned, Percentage Of Target Shares Granted

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- Definition

Represents the period over which a performance condition to the award is measured, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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Weighted-average period over which cost not yet recognized is expected to be recognized for 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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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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://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI https://asc.fasb.org/extlink&oid=128089324&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.

+ References

No definition available.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)(iii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

Percentage of vesting of award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

No definition available.

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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions	1 Months Ended															12 Months Ended
	Feb. 28, 2023	Jan. 31, 2023	May 31, 2022	Feb. 28, 2022	May 31, 2021	Feb. 28, 2021	May 31, 2020	Feb. 29, 2020	Jan. 31, 2020	May 31, 2019	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017	Jan. 31, 2017	Feb. 29, 2016	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2013
Stock-based compensation
Shares tendered by employees to pay employee withholding taxes (in shares)																133,011	135,616	141,801
Nonvested Share Units
Stock-based compensation
Granted (in shares)																161,000	212,000	350,000
Nonvested shares, share units or DEU
Stock-based compensation
Total fair value of shares vested																$ 18.4	$ 19.5	$ 18.5
Nonvested shares or share units outstanding
Stock-based compensation
Total unrecognized compensation expense																$ 15.7
Expected weighted average period for recognition of expense																2 years 2 months 12 days
Certain Senior Management \| Performance-based share awards
Stock-based compensation
Share-based payment arrangement, plan modification, incremental cost																$ 4.0
Total unrecognized compensation expense																$ 0.4
Expected weighted average period for recognition of expense																2 months 12 days
Time-Based Share Awards \| Nonvested Shares
Stock-based compensation
Granted (in shares)																87,000	93,000	69,000
Time-Based Share Awards \| Nonvested Shares \| Subsequent Event
Stock-based compensation
Granted (in shares)		301,495
Time-Based Share Awards \| Employee \| Nonvested Share Units \| Incentive Program Bonus Award Fiscal Year Performance
Stock-based compensation
Vesting period						3 years		3 years	3 years		3 years	3 years	3 years	3 years	3 years
Time-Based Share Awards \| Employee \| Nonvested Share Units \| Incentive Program Bonus Award Fiscal Year Performance \| First Vesting Date
Stock-based compensation
Vesting percentage						33.33%
Time-Based Share Awards \| Employee \| Nonvested Share Units \| Incentive Program Bonus Award Fiscal Year Performance \| Second Vesting Date
Stock-based compensation
Vesting percentage						33.33%
Time-Based Share Awards \| Employee \| Nonvested Share Units \| Incentive Program Bonus Award Fiscal Year Performance \| Third Vesting Date
Stock-based compensation
Vesting percentage						33.33%
Time-Based Share Awards \| Director \| Nonvested Share Units \| Maximum
Stock-based compensation
Vesting period			1 year		1 year		1 year			1 year
Time-Based Share Awards \| Certain Employees \| Nonvested Shares \| Subsequent Event
Stock-based compensation
Granted (in shares)	75,581
Compounded Annual Book Value Per Share Growth 16% \| Nonvested Shares \| Performance Based Grants 2015, 2016, 2017 & 2018
Stock-based compensation
Vesting percentage																100.00%
Time and Performance- Based Share Awards \| Nonvested Shares
Stock-based compensation
Granted (in shares)																308,000	281,000	109,000
Time and Performance- Based Share Awards \| Certain Senior Management \| Nonvested Shares \| Subsequent Event
Stock-based compensation
Granted (in shares)	394,319
2013 Plan
Stock-based compensation
Shares authorized (in shares)																			7,500,000
Number of share available for future grant (in shares)																2,800,000
2013 Plan \| Time-Based Share Awards \| Certain Senior Management \| Nonvested Shares
Stock-based compensation
Performance period				3 years		3 years		3 years			3 years	3 years	3 years
2013 Plan \| Time-Based Share Awards \| Certain Senior Management \| Nonvested Shares \| First Vesting Date
Stock-based compensation
Vesting percentage						33.33%
2013 Plan \| Time-Based Share Awards \| Certain Senior Management \| Nonvested Shares \| Second Vesting Date
Stock-based compensation
Vesting percentage						33.33%
2013 Plan \| Time-Based Share Awards \| Certain Senior Management \| Nonvested Shares \| Third Vesting Date
Stock-based compensation
Vesting percentage						33.33%
2013 Plan \| Vesting Based On Performance \| Certain Senior Management \| Nonvested Shares
Stock-based compensation
Performance period				3 years		3 years		3 years			3 years	3 years	3 years
2013 Plan \| Vesting Based On Performance \| Certain Senior Management \| Nonvested Shares \| Maximum
Stock-based compensation
Vesting percent																200.00%