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Share Plans - Additional Information (Details) $ / shares in Units, $ in Millions	1 Months Ended						12 Months Ended
	Jun. 30, 2025 shares	Mar. 31, 2025 shares	Jun. 30, 2024 shares	Mar. 31, 2024 shares	Jun. 30, 2023 shares	Mar. 31, 2023 shares	Dec. 31, 2025 USD ($) $ / shares	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2025 £ / shares	Dec. 31, 2025 USD ($) $ / shares	Dec. 31, 2024 £ / shares	Dec. 31, 2024 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Loan outstanding from ESOP											$ 0.3		$ 0.4
Common stock, par value (in GBP per share) | £ / shares										£ 0.50		£ 0.50
Total share-based compensation charges							$ 3.6	$ 3.5	$ 2.8
Awards cancelled or modified during period (in shares)							0.0	0.0	0.0
Tax benefit realized for the tax deductions from option exercises							$ 0.5	$ 0.3	$ 0.4
Weighted average fair value of options granted (in USD per share) | $ / shares							$ 8.93	$ 7.13	$ 14.73
Total intrinsic value of options exercised							$ 2.2	$ 1.4	$ 1.7
Total unrecognized compensation cost related to share options											$ 2.5		$ 3.2
Discontinued operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation charges							$ 0.3	$ 0.0	$ 0.0
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 1 month 6 days	1 year 9 months 18 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		4 years
Award expiration period		2 years		2 years		2 years
Award granted during period (in shares) | shares		138,000		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		1 year
Award granted during period (in shares) | shares	46,000		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		199,000		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											$ 13.53		$ 13.09

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