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Short-Term Borrowings (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2021 | Sep. 30, 2025 | Dec. 31, 2023 | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
Short-term Debt [Line Items] |  |  |  |  |  |
Notional Amount of Nonderivative Instruments | $ 40,000,000 | $ 50,000,000.0 | $ 30,000,000 | $ 50,000,000.0 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 349,900,000 |  | 349,900,000 |  |
Short-term borrowing |  | $ 95,800,000 |  | $ 95,800,000 | $ 196,500,000 |
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  | 4.96% |  | 4.96% | 5.06% |
Draws on letters of credit |  |  |  | $ 4,300,000 |  |
Revolving Line of Credit, Short-term |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Aggregate Investment, Maximum |  | $ 250,000,000.0 |  | $ 250,000,000.0 |  |
Interest Rate Credit Adjustment |  | 10 |  | 10 |  |
Line of Credit Facility, Interest Rate Description |  |  |  | 1.05 percent |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Increase Request |  | $ 50,000,000.0 |  | $ 50,000,000.0 |  |
3.48% note, due May 31, 2038 [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.48% |  | 3.48% |  |
Revolving Line of Credit, Total |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Aggregate Investment, Maximum |  | $ 450,000,000.0 |  | $ 450,000,000.0 |  |
Revolving Line of Credit, 5 year |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Aggregate Investment, Maximum |  | 200,000,000.0 |  | $ 200,000,000.0 |  |
Line of Credit Facility, Interest Rate Description |  |  |  | 1.25 percent |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Increase Request |  | 100,000,000.0 |  | $ 100,000,000.0 |  |
Committed Line of Credit Facility Two [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  | LIBOR rate, plus 0.75 percent |  |
Committed Line of Credit Facility Three [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  | Lender's base rate, plus 0.75 percent |  |
Committed Line of Credit Facility Five [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  | Lender's base rate, plus 0.85 percent |  |
Committed Line of Credit Facility Four [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  | LIBOR rate, plus 1.125 percent |  |
Committed Line of Credit Facility Six [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  | LIBOR rate, plus 1.75 percent |  |
Committed Line of Credit Facility Seven [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  | LIBOR rate, plus 1.75 percent |  |
Committed Line of Credit Facility Eight [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  | LIBOR rate, plus 1.75 percent |  |
Committed Line of Credit Facility Nine [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  | LIBOR rate, plus 1.75 percent |  |
Committed Line of Credit Facility One [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  | LIBOR rate, plus 0.75 percent |  |
Revolving Credit Facility |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 450,000,000.0 |  | $ 450,000,000.0 |  |
Interest Rate Swap Rate, Low Range [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Fixed Swap Rate |  |  | 0.20% |  |  |
Interest Rate Swap Rate, High Range [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Fixed Swap Rate |  | 3.97% | 0.205% | 3.97% | 0.17% | 3.98%

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