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Share-based compensation plans - Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	$ 5.9	$ 8.4	$ 20.5	$ 26.4
Cash based awards	1.0	0.9	1.8	2.3
Income tax benefit	(1.4)	(1.9)	(4.7)	(6.0)
Share-based payment expense, net of tax	4.5	6.5	15.8	20.4
Performance Shares Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	2.0	4.7	9.7	15.5
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	2.4	2.5	7.8	7.6
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	$ 0.5	$ 0.3	$ 1.2	$ 1.0

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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