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Fair Value Accounting - Assets and liabilities measured at fair value on recurring basis (Details) - Fair value measurements, recurring - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Assets:    
Cash equivalents $ 133.0  
Business Combination, Contingent Consideration, Asset [1] 15.4  
Total assets 148.4  
Liabilities:    
Contingent consideration liability [2] 1.4 $ 2.7
Total liabilities 1.4 2.7
Level 1    
Assets:    
Cash equivalents 133.0  
Business Combination, Contingent Consideration, Asset [1] 0.0  
Total assets 133.0  
Liabilities:    
Contingent consideration liability [2] 0.0 0.0
Total liabilities 0.0 0.0
Level 2    
Assets:    
Cash equivalents 0.0  
Business Combination, Contingent Consideration, Asset [1] 0.0  
Total assets 0.0  
Liabilities:    
Contingent consideration liability [2] 0.0 0.0
Total liabilities 0.0 0.0
Level 3    
Assets:    
Cash equivalents 0.0  
Business Combination, Contingent Consideration, Asset [1] 15.4  
Total assets 15.4  
Liabilities:    
Contingent consideration liability [2] 1.4 2.7
Total liabilities $ 1.4 $ 2.7
[1] Included in other assets on the Consolidated Balance Sheets.
[2] Included in accrued liabilities on the Consolidated Balance Sheets