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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
Mar. 31, 2025
Dec. 31, 2024
Assets:    
Cash equivalents $ 66.0 $ 133.0
Business Combination, Contingent Consideration, Asset 15.6 [1] 15.4
Total assets 81.6 148.4
Liabilities:    
Contingent consideration liability 1.5 [2] 1.4
Total liabilities 1.5 1.4
Level 1    
Assets:    
Cash equivalents 66.0 133.0
Business Combination, Contingent Consideration, Asset 0.0 [1] 0.0
Total assets 66.0 133.0
Liabilities:    
Contingent consideration liability 0.0 [2] 0.0
Total liabilities 0.0 0.0
Level 2    
Assets:    
Cash equivalents 0.0 0.0
Business Combination, Contingent Consideration, Asset 0.0 [1] 0.0
Total assets 0.0 0.0
Liabilities:    
Contingent consideration liability 0.0 [2] 0.0
Total liabilities 0.0 0.0
Level 3    
Assets:    
Cash equivalents 0.0 0.0
Business Combination, Contingent Consideration, Asset 15.6 [1] 15.4
Total assets 15.6 15.4
Liabilities:    
Contingent consideration liability 1.5 [2] 1.4
Total liabilities $ 1.5 $ 1.4
[1] Included in other assets on the Consolidated Balance Sheets.
[2] Included in accrued liabilities on the Consolidated Balance Sheets.