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Debt and Financing Arrangements (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
May 02, 2024
Unsecured Local Credit Facilities      
Line of Credit Facility [Line Items]      
Weighted average interest rate (as percent) 0.72% 0.61%  
Available borrowings $ 33,200,000    
Other short-term borrowings, outstanding borrowings $ 22,700,000 $ 10,200,000  
Senior Unsecured Notes due 2028 | Unsecured Local Credit Facilities      
Line of Credit Facility [Line Items]      
Debt instrument interest rate stated percentage 7.375% 7.375%  
Amount outstanding $ 350,000,000.0 $ 350,000,000.0  
Effective interest rate 7.813%    
Accrued interest $ 11,800,000 5,600,000  
Senior Unsecured Notes due 2028 | Unsecured Local Credit Facilities | Level 2      
Line of Credit Facility [Line Items]      
Fair value of notes 363,500,000 362,100,000  
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity     $ 950,000,000
Outstanding borrowings $ 529,700,000 $ 404,700,000  
Weighted average interest rate (as percent) 5.61% 5.51%  
Available borrowings $ 416,100,000    
Letters of credit outstanding 4,200,000    
Letters of Credit      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 59,200,000    
Outstanding borrowings 7,300,000 $ 5,700,000  
Line of credit secured $ 4,200,000 $ 2,900,000