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Share Plans - Additional Information (Details) $ / shares in Units, $ in Millions	1 Months Ended				12 Months Ended
	Jun. 30, 2024 shares	Mar. 31, 2024 shares	Jun. 30, 2023 shares	Mar. 31, 2023 shares	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($) $ / shares	Dec. 31, 2024 £ / shares	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 £ / shares	Dec. 31, 2023 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Loan outstanding from ESOP									$ 0.4		$ 0.5
Common stock, par value (in GBP per share) | £ / shares								£ 0.50		£ 0.50
Awards cancelled or modified during period (in shares)					$ 0.0	$ 0.0	$ 0.0
Tax benefit realized for the tax deductions from option exercises					$ 0.3	$ 0.4	$ 0.8
Weighted average fair value of options granted (in USD per share) | $ / shares					$ 7.13	$ 14.73	$ 16.45
Total intrinsic value of options exercised					$ 1.4	$ 1.7	$ 2.9
Total unrecognized compensation cost related to share options									$ 3.2		$ 2.8
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to share options, period for recognition					1 year 9 months 18 days	2 years 4 months 24 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 expiration period		2 years		2 years
Award granted during period (in shares) | shares		155,000		127,000
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
Award granted during period (in shares) | shares	47,000		31,000
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		392,000		157,000
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									$ 13.09		$ 8.94

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