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Financing - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 28, 2021 | Apr. 16, 2020 | Jan. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Sep. 30, 2021 | Jul. 27, 2021
Short-term Debt [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  |  |  | $ 375,700,000 | $ 0 |
Commercial Paper |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Proceeds from Short-term Debt |  |  | $ 100,000,000 | $ 150,000,000 |  |  |
Commercial Paper |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  |  |  | 27,200,000 | 0 |
Commercial Paper | Commercial Paper |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Debt instrument, maximum borrowing capacity | $ 650,000,000 |  |  |  |  |  | $ 550,000,000
Debt instrument, term (in days) | 397 days |  |  |  |  |  |
Notes Payable to Banks |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Debt instrument, term (in days) |  | 364 days |  |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 650,000,000 |  |  |  |  |  | $ 550,000,000
Line of credit facility, term (in years) | 5 years |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  | 67,000,000 |  |
Long-term debt |  |  |  |  | 0 | 0 |
Line of Credit | Revolving Credit Facility | Minimum |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Debt to capitalization ratio not to exceed | 0.65 |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Minimum | LIBOR |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Margin rate | 0.00% |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Minimum | Index Debt Rating |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Margin rate | 0.805% |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Maximum |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Debt to capitalization ratio not to exceed | 1.00 |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Maximum | LIBOR |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Margin rate | 0.50% |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Maximum | Index Debt Rating |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Margin rate | 1.50% |  |  |  |  |  |
364-Day Credit Agreement | Line of Credit |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  |  |  | $ 348,500,000 | $ 0 |

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