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Debt - Revolving credit facility (Narrative) (Details) - Credit and Guarantee Agreement - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Feb. 28, 2021 | Feb. 28, 2018 | Sep. 30, 2024 | Apr. 30, 2017
Letter of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Commitment fee (percent) |  |  | 1.375% |  |
Fronting fee (percent) |  |  | 0.125% |  |
Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Unused capacity, commitment fee (percent) |  |  | 0.20% |  |
Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Covenant terms, minimum liquidity balance |  |  | $ 100,000,000 |  |
Line of Credit | Letter of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 65,000,000 | 187,500,000 |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 500,000,000 | $ 725,000,000 |  | $ 600,000,000
Line of credit facility, accordion feature, increase limit |  | 250,000,000 |  |  |
Debt issuance fees | $ 100,000 | 1,700,000 |  |  |
Write off of deferred debt issuance cost |  | $ 200,000 |  |  |
Aggregate letters of credit outstanding amount |  |  |  | $ 30,500,000 |
Remaining borrowing capacity |  |  |  | $ 469,500,000 |
Line of Credit | Revolving Credit Facility | SOFR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread adjustment | 0.10% |  |  |  |
Basis spread on variable rate (percent) |  |  | 1.375% |  |
Line of Credit | Revolving Credit Facility | Base Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 0.375% |  |

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- Definition Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479359/835-30-S45-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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