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v3.24.0.1

Financing (Narrative) (Details) |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 03, 2023 USD ($) | Mar. 17, 2023 USD ($) | Feb. 05, 2018 USD ($) | Dec. 31, 2013 USD ($) | Nov. 30, 2006 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Apr. 04, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of term facility |  |  |  |  |  | $ 245,000,000.0 | $ 0 | $ 0 |
Total debt to total capitalization ratio |  |  |  |  |  | 0.401 |  |  |
4.45% notes due December 2023 | Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 4.45% |  |  | 4.45% |  | 4.45%
Debt instrument, term |  |  |  | 10 years |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 300,000,000 |  |  |  |  | $ 300,000,000
Redemption price percentage |  |  |  | 101.00% |  |  |  |  |
Effective annualized interest rate |  |  |  | 4.56% |  |  |  |  |
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 | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit spread adjustment |  | 0.10% |  |  |  |  |  |  |
Margin rate |  | 1.50% |  |  |  |  |  |  |
Credit Agreement | Line of Credit | Variable Rate Component One | Maximum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Margin rate |  | 2.25% |  |  |  |  |  |  |
Credit Agreement | Line of Credit | Variable Rate Component Two | Minimum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Margin rate |  | 0.50% |  |  |  |  |  |  |
Credit Agreement | Line of Credit | Variable Rate Component Two | Maximum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Margin rate |  | 1.25% |  |  |  |  |  |  |
Credit Agreement | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, term |  | 5 years |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |
Debt instrument, term | 3 years | 3 years |  |  |  |  |  |  |
Maximum borrowing capacity | $ 350,000,000 | $ 350,000,000 |  |  |  |  |  |  |
Repayments of term facility |  |  |  |  |  | $ 245,000,000 |  |  |
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 |  |  |  |  |  | $ 190,700,000 | $ 153,200,000 |  |
Open standby letters of credit |  |  |  |  |  | $ 69,700,000 | $ 57,100,000 |  |

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