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Acquisitions - Schedule of Pro Forma Financial Statements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Business Combination [Line Items]          
Total revenue $ 860.5 $ 864.4 $ 2,459.3 $ 2,386.8  
Net income (loss) $ (59.6) $ 40.9 $ (34.6) $ 99.4  
Before Adjustments          
Business Combination [Line Items]          
Total revenue         $ 3,426.0
Net income (loss)         115.3
Pro Forma Adjustments          
Business Combination [Line Items]          
Total revenue         0.0
Net income (loss)         (15.7)
After Adjustments          
Business Combination [Line Items]          
Total revenue         3,426.0
Net income (loss)         $ 99.6