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Income Taxes - Schedule of Effective Income Tax Reconciliation (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
Income (loss) before income taxes $ 7.5 $ (2.9) $ 158.0
U.S. statutory tax rate 21.00% 21.00% 21.00%
Taxes at the U.S. statutory rate $ 1.6 $ (0.6) $ 33.2
Tax effected differences      
State and local taxes, net of federal benefit 0.5 0.8 7.3
Share-based payments 4.6 0.3 0.6
Nondeductible goodwill impairment     1.1
Change in valuation allowance (2.4) 3.7 (16.5)
Return to provision adjustments 0.9 0.3 0.1
Change in tax rates (0.6) 0.5 0.3
Nondeductible expenses 0.7 0.4 1.1
Other, net   (0.1)  
Total provision for income taxes $ 5.3 $ 5.3 $ 27.2