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Credit and Other Debt Agreements - Note Purchase Agreements - Additional Information (Detail) - USD ($) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 14, 2022 | May 05, 2021 | Feb. 10, 2021 | Dec. 31, 2022
Series G note [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Operating cash to fund | $ 200.0 |  |  |
Note Purchase Agreements [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Realized a cash gain (loss) on hedging transaction |  | $ (17.2) | $ (22.9) |
Derivative instrument, term |  | 10 years | 10 years |
Amount payable to redeem the notes, percent of the principal amount |  |  |  | 100.00%
Discount rate used to compute the remaining scheduled payments of principal and interest |  |  |  | U.S. Treasury yield plus 0.5
Note Purchase Agreements [Member] | Fixed Rate of 5.18%, Balloon Due February 10, 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt |  |  | $ 75.0 |
Note Purchase Agreements [Member] | Private Placement [Member] | Unsecured Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes issued and sold |  | $ 75.0 | $ 100.0 |
Weighted average maturity of notes |  | 15 years | 15 years |
Weighted average interest rate of notes |  | 3.98% | 3.97% |
Debt instrument, interest rate |  | 2.46% | 2.44% |
Debt instrument, due date |  | 2036 | 2036 |

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- Definition Amount Payable to Redeem the Notes, Percent of the Principal Amount + References No definition available. + Details
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- Definition Discount Rate used to Compute the Remaining Scheduled Payments of Principal and Interest + References No definition available. + Details
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- Definition Operating cash to fund. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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