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Segment Information - Reconciliation of Reportable Segment Revenues, Other Income and Adjusted EBITDA to Net (loss) Income (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenues    
Revenues $ 147.7 $ 133.4
Other Income, net    
Other income, net 0.0 1.0
Costs and Expenses [Abstract]    
Cost of revenues 51.4 47.5
Selling, General and Administrative Expense 54.1 55.5
Adjusted EBITDA    
All Other Category Adjusted EBITDA 0.7 0.2
General corporate and other expenses (13.3) (15.5)
Interest expense, net (15.1) (9.8)
Depreciation and amortization expense (6.4) (7.1)
Stock-based compensation expense (2.6) (2.5)
Other items (8.8) (6.9)
Income before income taxes 20.7 14.5
Connections Segment [Member]    
Revenues    
Revenues 138.3 123.4
Other Income, net    
Other income, net 0.0 1.0
Costs and Expenses [Abstract]    
Cost of revenues 48.8 45.3
Selling, General and Administrative Expense 23.4 23.0
Expenses 72.2 68.3
Adjusted EBITDA    
Subtotal Adjusted EBITDA 66.2 56.1
All Other [Member]    
Revenues    
Revenues 9.4 10.0
Costs and Expenses [Abstract]    
Cost of revenues 2.6 2.2
Selling, General and Administrative Expense $ 6.1 $ 7.6