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

No definition available.

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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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- Definition

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.

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

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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.

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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).

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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.

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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

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

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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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- Definition

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

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- Definition

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

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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
	Jan. 01, 2023	Jan. 01, 2022	Jan. 01, 2021	Feb. 28, 2024	May 31, 2023	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	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2013
Stock-based compensation
Shares tendered by employees to pay employee withholding taxes (in shares)																		119,334	133,011	135,616
Performance-based share awards
Stock-based compensation
Vesting period																		3 years	3 years	3 years
Nonvested Share Units
Stock-based compensation
Granted (in shares)																		567,000	161,000	212,000
Nonvested shares, share units or DEU
Stock-based compensation
Total fair value of shares vested																		$ 15.3	$ 18.4	$ 19.5
Nonvested shares or share units outstanding
Stock-based compensation
Total unrecognized compensation expense																		$ 26.9
Expected weighted average period for recognition of expense																		2 years 6 months
Certain Senior Management \| Performance-based share awards
Stock-based compensation
Incremental cost																		$ 4.0
Time-Based Share Awards \| Nonvested Shares
Stock-based compensation
Granted (in shares)																		75,000	87,000	93,000
Time-Based Share Awards \| Nonvested Share Units
Stock-based compensation
Granted (in shares)							46,252
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
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%							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%							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%							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 Share Units \| Subsequent Event
Stock-based compensation
Granted (in shares)				61,788
Compounded Annual Book Value Per Share Growth \| Nonvested Shares \| Performance Based Grants 2018, 2019 and 2020
Stock-based compensation
Vesting percentage																		100.00%
Time and Performance- Based Share Awards \| Nonvested Shares
Stock-based compensation
Granted (in shares)																		300,000	308,000	281,000
Time and Performance- Based Share Awards \| Certain Senior Management \| Nonvested Shares \| Subsequent Event
Stock-based compensation
Granted (in shares)				296,670
Time and Performance- Based Share Awards \| Certain Senior Management \| Nonvested Share Units \| Subsequent Event
Stock-based compensation
Granted (in shares)				66,547
2013 Plan
Stock-based compensation
Shares authorized (in shares)																					7,500,000
Number of share available for future grant (in shares)																		3,800,000
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	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%		33.33%	33.33%		33.33%
2013 Plan \| Time-Based Share Awards \| Certain Senior Management \| Nonvested Shares \| Second Vesting Date
Stock-based compensation
Vesting percentage						33.33%		33.33%	33.33%		33.33%
2013 Plan \| Time-Based Share Awards \| Certain Senior Management \| Nonvested Shares \| Third Vesting Date
Stock-based compensation
Vesting percentage						33.33%		33.33%	33.33%		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	3 years
2013 Plan \| Vesting Based On Performance \| Certain Senior Management \| Nonvested Shares \| Maximum
Stock-based compensation
Vesting percent																		200.00%