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Fair Value Measurements - Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Liabilities      
Decrease in this balance $ (5.2) $ (5.2)  
Level 1      
Assets      
Cash equivalents   721.5 $ 1,139.5
Liabilities      
Contingent acquisition obligations   0.0 0.0
Level 2      
Assets      
Cash equivalents   0.0 0.0
Liabilities      
Contingent acquisition obligations   0.0 0.0
Level 3      
Assets      
Cash equivalents   0.0 0.0
Liabilities      
Contingent acquisition obligations   0.3 5.5
Fair Value, Total      
Assets      
Cash equivalents   721.5 1,139.5
Liabilities      
Contingent acquisition obligations   $ 0.3 $ 5.5