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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, 2025
Dec. 31, 2024
Assets:    
Cash equivalents $ 77.0 $ 133.0
Contingent consideration asset 2.2 15.4 [1]
Total assets 79.2 148.4
Liabilities:    
Contingent consideration liability [2]   1.4
Total liabilities   1.4
Level 1    
Assets:    
Cash equivalents 77.0 133.0
Contingent consideration asset 0.0 0.0 [1]
Total assets 77.0 133.0
Liabilities:    
Contingent consideration liability [2]   0.0
Total liabilities   0.0
Level 2    
Assets:    
Cash equivalents 0.0 0.0
Contingent consideration asset 0.0 0.0 [1]
Total assets 0.0 0.0
Liabilities:    
Contingent consideration liability [2]   0.0
Total liabilities   0.0
Level 3    
Assets:    
Cash equivalents 0.0 0.0
Contingent consideration asset 2.2 15.4 [1]
Total assets $ 2.2 15.4
Liabilities:    
Contingent consideration liability [2]   1.4
Total liabilities   $ 1.4
[1] Included in other assets on the Consolidated Balance Sheets.
[2] Included in accrued liabilities on the Consolidated Balance Sheets