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Financing (Narrative) (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 11, 2022 | Jul. 28, 2021 | Dec. 31, 2013 | Nov. 30, 2006 | Dec. 31, 2022 | Dec. 31, 2021 | Jul. 27, 2021 | Feb. 05, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 543,700,000 | $ 842,400,000 |  |
Total indebtedness to capitalization |  |  |  |  | 0.395 |  |  |
Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  | 364 days | 364 days |  |
Commercial paper |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, term |  | 397 days |  |  |  |  |  |
Debt instrument, maximum borrowing capacity |  | $ 650,000,000 |  |  |  |  | $ 550,000,000 |
Line of Credit | Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, term | 364 days |  |  |  |  |  |  |
Debt instrument, maximum borrowing capacity | $ 400,000,000 |  |  |  |  |  |  |
Line of Credit | Minimum | London Interbank Offered Rate (LIBOR) | Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.25% |  |  |  |  |  |  |
Line of Credit | Minimum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.25% |  |  |  |  |  |  |
Line of Credit | Maximum | London Interbank Offered Rate (LIBOR) | Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.50% |  |  |  |  |  |  |
Line of Credit | Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.50% |  |  |  |  |  |  |
Line of Credit | Standby Letters of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 66,800,000 | $ 49,500,000 |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 650,000,000 |  |  |  |  | $ 550,000,000 |
Line of credit facility, expiration period |  | 5 years |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 0 | $ 0 |  |
Line of Credit | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, covenant, debt to capitalization ratio not to exceed |  | 0.65 |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.00% |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Minimum | Index Debt Rating |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.805% |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, covenant, debt to capitalization ratio not to exceed |  | 1.00 |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.50% |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Maximum | Index Debt Rating |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.50% |  |  |  |  |  |
6.55% notes due November 2036 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of notes issued repurchased |  |  |  | 101.00% |  |  |  |
Annualized interest rate including debt issuance cost amortization |  |  |  |  | 6.67% |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 6.55% | 6.55% | 6.55% |  |
Long-term debt |  |  |  |  | $ 198,600,000 | $ 198,500,000 |  |
Notes issued, term |  |  |  | 30 years |  |  |  |
Notes issued |  |  |  | $ 200,000,000 |  |  |  |
4.20% notes due March 2048 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 4.20% | 4.20% |  |
Long-term debt |  |  |  |  | $ 346,500,000 | $ 346,300,000 |  |
4.20% notes due March 2048 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of notes issued repurchased |  |  |  |  | 101.00% |  |  |
Annualized interest rate including debt issuance cost amortization |  |  |  |  | 4.29% |  |  |
Debt instrument, face amounts |  |  |  |  |  |  |  | $ 350,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 4.20%
Letter of Credit Reimbursement Agreement | Line of Credit | Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 170,300,000 | $ 162,700,000 |  |
4.45% notes due December 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of notes issued repurchased |  |  | 101.00% |  |  |  |  |
Annualized interest rate including debt issuance cost amortization |  |  |  |  | 4.56% |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.45% |  | 4.45% | 4.45% |  |
Long-term debt |  |  |  |  | $ 0 | $ 299,400,000 |  |
Notes issued, term |  |  | 10 years |  |  |  |  |
Notes issued |  |  | $ 300,000,000 |  |  |  |  |

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