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Business Segments - Segment Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ 1,846.5 $ 1,472.0 $ 1,569.9
Primary      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 1,808.1 1,432.4 1,513.3
Corporate, unallocated      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ 38.4 $ 39.6 $ 56.6