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Debt and Financing Arrangements - Letter of Credit and Revolving Credit Facilities (Details) - USD ($) $ in Thousands | Dec. 17, 2019 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |
Outstanding borrowings |  | $ 155,687 | $ 484,287
Investments pledged as collateral |  | 262,400 |
Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ 750,000 |  |
Credit facility term | 5 years |  |
Secured letter of credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ 250,000 |  |
Optional increased capacity |  | 1,300,000 |
Remaining capacity |  | 31,600 |
Outstanding borrowings |  | 218,400 |
Unsecured revolving loan and letter of credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ 500,000 |  |
Arch Re US | Revolving Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Outstanding borrowings |  | 0 | 0
Other Arch Capital Subsidiaries | Secured letter of credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Outstanding borrowings |  | 250,000 |
Other Arch Capital Subsidiaries | Unsecured revolving loan and letter of credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Outstanding borrowings |  | 26,200 |
Watford Holdings Ltd |  |  |
Line of Credit Facility [Line Items] |  |  |
Outstanding borrowings |  | 126,000 |
Watford Holdings Ltd | Secured letter of credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | 100,000 |
Watford Holdings Ltd | Unsecured revolving loan and letter of credit facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | 50,000 |
Watford Holdings Ltd | Secured credit facility expiring November 2021 |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  | 440,000 |
Outstanding borrowings |  | 155,687 | $ 484,287
Letter of credit limit |  | $ 220,000 |

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- Definition Line Of Credit Facility Optional Increased Capacity + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer. + References No definition available. + Details
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- Definition Period remaining on line of credit facility before it terminates, 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 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 No definition available. + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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