Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Grants in Period

No definition available.

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- Definition

Face amount or stated value per share of common stock.

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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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- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

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- Definition

Amount of tax benefit from exercise of option under share-based payment arrangement.

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- Definition

The amount reported as a liability as of the balance sheet date by the entity (the employer) of the loan made by a third-party lender directly to the ESOP.

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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

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

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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- Definition

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

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Share Plans - Additional Information (Details) $ / shares in Units, $ in Millions	1 Months Ended							12 Months Ended
	Jun. 30, 2023 shares	Mar. 31, 2023 shares	Jun. 30, 2022 shares	May 31, 2022 shares	Mar. 31, 2022 shares	Jun. 30, 2021 shares	Mar. 31, 2021 shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2023 £ / shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 £ / shares	Dec. 31, 2022 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Loan outstanding from ESOP \| $												$ 0.5		$ 0.5
Tax benefit realized for the tax deductions from option exercises \| $								$ 0.4	$ 0.8	$ 1.1
Weighted average fair value of options granted (in USD per share) \| $ / shares								$ 14.73	$ 16.45	$ 20.56
Total intrinsic value of options exercised \| $								$ 1.7	$ 2.9	$ 5.8
Total unrecognized compensation cost related to share options \| $												$ 2.8		$ 3.1
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to share options, period for recognition								2 years 4 months 24 days	2 years 8 months 12 days
Long-Term Umbrella Incentive Plan (LTIP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period								4 years
Award expiration period								6 years
Long-Term Umbrella Incentive Plan (LTIP) \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage								25.00%
Long-Term Umbrella Incentive Plan (LTIP) \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage								25.00%
Long-Term Umbrella Incentive Plan (LTIP) \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage								25.00%
Long-Term Umbrella Incentive Plan (LTIP) \| Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage								25.00%
Long-Term Umbrella Incentive Plan (LTIP) \| Restricted Stock Units and Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years					4 years
Award granted during period (in shares) \| shares		127,000		19,000	130,000		110,000
Award expiration period		2 years			2 years		2 years
Long-Term Umbrella Incentive Plan (LTIP) \| Restricted Stock Units and Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					3 years
Long-Term Umbrella Incentive Plan (LTIP) \| Restricted Stock Units and Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					4 years
Non-Executive Directors Equity Incentive Plan (Director EIP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period								1 year
Non-Executive Directors Equity Incentive Plan (Director EIP) \| Restricted Stock Units and Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year		1 year	4 years		1 year
Award granted during period (in shares) \| shares	31,000		26,000			19,000
Non-Executive Directors Equity Incentive Plan (Director EIP) \| Restricted Stock Units and Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award granted during period (in shares) \| shares		157,000							280,000	100,000
Long-Term Umbrella Incentive Plan- vesting immediately \| Restricted Stock Units and Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award granted during period (in shares) \| shares				15,000
Ordinary shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (in GBP per share) \| (per share)										$ 0.50	£ 0.50	$ 0.50	£ 0.50	$ 0.50
Ordinary shares \| Employee Benefit Trust
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market value of shares held by ESOP (in USD per share) \| $ / shares												$ 8.94		$ 13.72