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Financing (Narrative) (Details) £ in Millions |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 17, 2023 USD ($) | Feb. 05, 2018 USD ($) | Nov. 30, 2006 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 09, 2024 USD ($) | Dec. 09, 2024 GBP (£)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of term facility |  |  |  | $ 105,000,000.0 | $ 245,000,000.0 | $ 0 |  |
Total debt to total capitalization ratio |  |  |  | 0.413 |  |  |  |
Credit Agreement | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net leverage ratio | 3.50 |  |  |  |  |  |  |
Maximum net leverage ratio | 4.00 |  |  |  |  |  |  |
Minimum interest coverage ratio | 3.00 |  |  |  |  |  |  |
Credit Agreement | Line of Credit | Variable Rate Component One | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit spread adjustment | 0.10% |  |  |  |  |  |  |
Margin rate | 1.50% |  |  |  |  |  |  |
Credit Agreement | Line of Credit | Variable Rate Component One | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Margin rate | 2.25% |  |  |  |  |  |  |
Credit Agreement | Line of Credit | Variable Rate Component Two | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Margin rate | 0.50% |  |  |  |  |  |  |
Credit Agreement | Line of Credit | Variable Rate Component Two | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Margin rate | 1.25% |  |  |  |  |  |  |
Credit Agreement | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 500,000,000 |  |  |  |  |  |  |
Credit Agreement | Revolving Credit Facility | Line of Credit | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Undrawn commitments fee percentage | 0.20% |  |  |  |  |  |  |
Credit Agreement | Revolving Credit Facility | Line of Credit | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Undrawn commitments fee percentage | 0.35% |  |  |  |  |  |  |
Credit Agreement | Term Facility | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Increase to line of credit facility |  |  |  |  |  |  | $ 200,000,000 |
Maximum borrowing capacity | $ 350,000,000 |  |  |  |  |  | $ 700,000,000 |
6.55% notes due November 2036 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 6.55% | 6.55% | 6.55% |  |  |
Debt instrument, term |  |  | 30 years |  |  |  |  |
Debt instrument, face amount |  |  | $ 200,000,000 |  |  |  |  |
Redemption price percentage |  |  | 101.00% |  |  |  |  |
Effective annualized interest rate |  |  | 6.67% |  |  |  |  |
4.20% notes due March 2048 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  | 4.20% |  | 4.20% | 4.20% |  |  |
Debt instrument, face amount |  | $ 350,000,000 |  |  |  |  |  |
Redemption price percentage |  | 101.00% |  |  |  |  |  |
Effective annualized interest rate |  | 4.29% |  |  |  |  |  |
Letter of Credit Reimbursement Agreement | Standby Letters of Credit | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 176,100,000 | $ 190,700,000 |  |  |
Open standby letters of credit |  |  |  | $ 38,800,000 | $ 69,700,000 |  |  |
The Credit Facility | Term Facility | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | £ |  |  |  |  |  |  |  | £ 300

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