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Debt and letter of credit facilities - Letter of Credit Facilities (Details) - Standby letters of credit | Mar. 31, 2025 USD ($)
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Line of Credit Facility [Line Items] |
Issued | $ 1,130,800,000
Cash and Cash Equivalents |
Line of Credit Facility [Line Items] |
Collateral | 23,100,000
Debt securities |
Line of Credit Facility [Line Items] |
Collateral | 1,307,300,000
Committed - Secured letters of credit facilities |
Line of Credit Facility [Line Items] |
Committed Capacity | 355,000,000.0
Issued | 253,200,000
Committed - Secured letters of credit facilities | Cash and Cash Equivalents |
Line of Credit Facility [Line Items] |
Collateral | 13,400,000
Committed - Secured letters of credit facilities | Debt securities |
Line of Credit Facility [Line Items] |
Collateral | 242,100,000
Uncommitted - Secured letters of credit facilities |
Line of Credit Facility [Line Items] |
Issued | 877,600,000
Uncommitted - Secured letters of credit facilities | Cash and Cash Equivalents |
Line of Credit Facility [Line Items] |
Collateral | 9,700,000
Uncommitted - Secured letters of credit facilities | Debt securities |
Line of Credit Facility [Line Items] |
Collateral | $ 1,065,200,000

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- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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- Details
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- Details
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