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Debt (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
GBP (£)
Dec. 31, 2024
USD ($)
Sep. 26, 2023
USD ($)
Debt Instrument [Line Items]              
Variable interest rate     Sterling Overnight Interbank Average Rate (SONIA) [Member]        
Average borrowings outstanding $ 856,800,000 $ 813,500,000 $ 835,200,000 $ 819,600,000      
Weighted average interest rate 6.00% 6.30% 6.00% 6.40%      
Interest expense, net $ 15,700,000 $ 23,619,000 $ 111,322,000 $ 130,041,000      
Interest expense (17,164,000) (25,896,000) (117,547,000) (136,607,000)      
5.75% Unsecured Notes maturing in 2026 [Member]              
Debt Instrument [Line Items]              
Unamortized debt issuance costs $ 500,000   $ 500,000     $ 1,000,000.0  
Interest rate 5.75%   5.75%   5.75% 5.75%  
Fair value of debt instrument $ 399,900,000   $ 399,900,000     $ 398,900,000  
Term Loan maturing in 2027 - $150 million [Member]              
Debt Instrument [Line Items]              
Unamortized debt issuance costs 400,000   400,000     500,000  
Loans Payable to Bank [1] 134,637,000   134,637,000     140,099,000  
Five-Year Credit Agreement maturing in 2027 [Member]              
Debt Instrument [Line Items]              
Credit facility current borrowing capacity 300,000,000   300,000,000        
Line of credit facility outstanding 67,172,000   $ 67,172,000     62,836,000  
GBP revolving credit facility borrowings [Member]              
Debt Instrument [Line Items]              
Line of credit facility outstanding | £         £ 50,000,000    
Applicable interest rate margin     1.375%        
Real Estate Term Loan maturing in 2028 - $75.2 million [Member]              
Debt Instrument [Line Items]              
Unamortized debt issuance costs           100,000  
Loans Payable to Bank [2] 67,985,000   $ 67,985,000     70,795,000  
Capital Term Loan maturing in 2028 - $65 million [Member]              
Debt Instrument [Line Items]              
Unamortized debt issuance costs 500,000   500,000     600,000  
Loans Payable to Bank [3] 52,025,000   52,025,000     $ 56,770,000  
Automotive [Member] | Delayed Draw Term Loan maturing in 2028 - $50 million [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Unused Borrowing Capacity, Amount             $ 50,000,000.0
Loans Payable to Bank 0   0        
Securities Subject to Mandatory Redemption [Member] | Graham Healthcare Group [Member]              
Debt Instrument [Line Items]              
Interest expense $ 700,000 $ 9,700,000 $ 68,300,000 $ 85,100,000      
[1] The carrying value is net of $0.4 million and $0.5 million of unamortized debt issuance costs as of September 30, 2025 and December 31, 2024, respectively.
[2] The carrying value is net of $0.1 million of unamortized debt issuance costs as of December 31, 2024.
[3] The carrying value is net of $0.5 million and $0.6 million of unamortized debt issuance costs as of September 30, 2025 and December 31, 2024, respectively.