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Segment Information - Reconciliation of Reportable Segment Revenues, Other Income and Adjusted EBITDA to Net Income (loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues        
Revenues $ 77.5 $ 72.6 $ 330.7 $ 292.0
Other Income, net        
Other income, net 0.0 0.0 0.0 1.0
Costs and Expenses [Abstract]        
Cost of revenues 25.3 23.1 117.3 103.7
Selling, General and Administrative Expense 51.3 40.8 152.5 135.8
Adjusted EBITDA        
All Other Category Adjusted EBITDA 2.2 1.6 4.7 3.7
General corporate and other expenses (12.5) (12.7) (38.3) (41.3)
Interest expense, net (10.1) (10.1) (34.8) (29.8)
Intangible asset impairment charges 0.0 (6.3) 0.0 (6.3)
Depreciation and amortization expense (8.7) (7.1) (22.7) (21.2)
Stock-based compensation expense (2.9) (0.7) (8.5) (4.7)
Other items (9.0) (3.1) (21.4) (10.4)
(Loss) income before income taxes (17.9) (14.8) 3.4 (3.8)
Connections Segment [Member]        
Revenues        
Revenues 67.5 62.4 301.2 260.8
Other Income, net        
Other income, net 0.0 0.0 0.0 1.0
Costs and Expenses [Abstract]        
Cost of revenues 22.9 20.7 109.8 96.2
Selling, General and Administrative Expense 21.5 18.1 67.0 59.4
Expenses 44.4 38.8 176.8 155.6
Adjusted EBITDA        
Subtotal Adjusted EBITDA 23.1 23.6 124.4 106.2
All Other [Member]        
Revenues        
Revenues 10.0 10.2 29.5 31.2
Costs and Expenses [Abstract]        
Cost of revenues 2.2 2.2 7.3 6.8
Selling, General and Administrative Expense $ 5.6 $ 6.4 $ 17.5 $ 20.7