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Segment information - Reconciliation of Total Business Segment Assets to Consolidated Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ 1,872.3 $ 1,965.4 $ 2,065.6
Cash and cash equivalents 376.5 387.7  
Deferred income taxes 96.6 114.0  
Operating lease right-of-use assets 38.4 35.4  
Prepaid pension and postretirement assets 25.6 38.0  
Operating Segments      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 1,169.7 1,253.4 1,267.2
Segment Reconciling Items      
Segment Reporting, Asset Reconciling Item [Line Items]      
Other assets 25.2 25.3 20.2
Cash and cash equivalents 376.5 387.7 391.8
Deferred income taxes 96.6 114.0 118.6
Operating lease right-of-use assets 38.4 35.4 42.5
Prepaid pension and postretirement assets 25.6 38.0 119.5
Corporate      
Segment Reporting, Asset Reconciling Item [Line Items]      
Other assets $ 140.3 $ 111.6 $ 105.8