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Financing (Narrative) (Details) |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 28, 2021 USD ($) | Apr. 16, 2020 USD ($) | Jan. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2013 USD ($) | Nov. 30, 2006 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jul. 27, 2021 USD ($) | Apr. 16, 2020 EUR (€) | Feb. 05, 2018 USD ($) | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  | $ 0 | $ 375,700,000 |  |  |  |
Long-term debt |  |  |  |  |  |  | $ 842,400,000 | 842,900,000 |  |  |  |
Total indebtedness to capitalization |  |  |  |  |  |  | 0.315 |  |  |  |  |
Commercial paper |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maximum borrowing capacity | $ 650,000,000 |  |  |  |  |  |  |  | $ 550,000,000 |  |  |
Debt instrument, term | 397 days |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  | $ 0 | $ 27,200,000 |  |  |  |
Proceeds from short-term debt |  |  | $ 100,000,000 | $ 150,000,000 |  |  |  |  |  |  |  |
Notes Payable to Banks |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  | 364 days |  |  |  |  | 364 days | 364 days |  |  |  |
Line of Credit | Standby Letters of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 49,500,000 | $ 57,900,000 |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
Notes issued, term |  |  |  |  |  | 30 years |  |  |  |  |  |
Notes issued |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 6.55% | 6.55% | 6.55% |  |  |  |
Percentage of notes issued repurchased |  |  |  |  |  | 101.00% |  |  |  |  |  |
Annualized interest rate including debt issuance cost amortization |  |  |  |  |  |  | 6.67% |  |  |  |  |
Long-term debt |  |  |  |  |  |  | $ 198,500,000 | $ 198,400,000 |  |  |  |
4.20% notes due March 2048 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 4.20% | 4.20% |  |  |  |
Long-term debt |  |  |  |  |  |  | $ 346,300,000 | $ 346,200,000 |  |  |  |
4.20% notes due March 2048 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amounts |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 4.20% |
Percentage of notes issued repurchased |  |  |  |  |  |  | 101.00% |  |  |  |  |
Annualized interest rate including debt issuance cost amortization |  |  |  |  |  |  | 4.29% |  |  |  |  |
Letter of Credit Reimbursement Agreement | Line of Credit | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 162,700,000 | 183,400,000 |  |  |  |
364-Day Credit Agreement | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  | $ 0 | $ 348,500,000 |  |  |  |
Debt instrument, face amounts |  | $ 300,000,000 |  |  |  |  |  |  |  | € 40,000,000 |  |
4.45% notes due December 2023 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes issued, term |  |  |  |  | 10 years |  |  |  |  |  |  |
Notes issued |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 4.45% | 4.45% |  |  |  | 4.45%
Percentage of notes issued repurchased |  |  |  |  | 101.00% |  |  |  |  |  |  |
Annualized interest rate including debt issuance cost amortization |  |  |  |  |  |  | 4.56% |  |  |  |  |
Long-term debt |  |  |  |  |  |  | $ 299,400,000 | $ 299,100,000 |  |  |  |

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