Income taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Tax Disclosure [Abstract]
Income tax expense	$ (11.6)	$ (14.2)	$ (24.9)	$ (23.9)
Pre-tax income	$ 74.9	$ 129.0	$ 150.2	$ 234.6
Effective tax rate	15.50%		16.60%
Unrecognized tax benefits	$ 0.9		$ 0.9
Unrecognized tax benefits that would impact the effective tax rate	$ 0.8		$ 0.8

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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+ Details