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Share-based compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
2023 LTIP
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation expense		$ 0.0	$ 61.5	$ 0.0
2026 Incentive Award Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation expense	$ 3.9		5.0
2026 Incentive Award Plan \| RSUs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted-average grant-date fair value (in USD per share)	$ 32.53
Unrecognized compensation cost related to non-vested RSU awards	$ 50.4		$ 50.4
2026 Incentive Award Plan \| RSUs \| Employee
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Grants in period (in shares)	1,499,879
Vesting period	4 years
2026 Incentive Award Plan \| RSUs \| Nonemployee
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Grants in period (in shares)	202,221
Vesting period	2 years