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Debt and Financing Arrangements - Schedule of senior notes outstanding (Details) - USD ($)
$ in Thousands

Jul. 02, 2019

Dec. 31, 2021

Dec. 31, 2020

Debt Instrument [Line Items]

Carrying amount

$ 2,724,394

$ 2,861,113

Senior Notes

Debt Instrument [Line Items]

Principal amount

2,750,000

Carrying amount

$ 2,724,394

2,861,113

Senior Notes | 7.350% senior notes due 2034

Debt Instrument [Line Items]

Stated interest rate (percentage)

^[1]

7.35%

Principal amount

^[1]

$ 300,000

Carrying amount

$ 297,488

297,367

Senior Notes | 5.144% senior notes due 2043

Debt Instrument [Line Items]

Stated interest rate (percentage)

^[2]

5.144%

Principal amount

^[2]

$ 500,000

Carrying amount

$ 495,063

494,944

Senior Notes | 4.011% senior notes due 2026

Debt Instrument [Line Items]

Stated interest rate (percentage)

^[3]

4.011%

Principal amount

^[3]

$ 500,000

Carrying amount

$ 497,633

497,211

Senior Notes | 5.031% senior notes due 2046

Debt Instrument [Line Items]

Stated interest rate (percentage)

^[4]

5.031%

Principal amount

$ 450,000

Carrying amount

$ 445,490

445,402

Senior Notes | 3.635% senior notes due 2050

Debt Instrument [Line Items]

Stated interest rate (percentage)

^[5]

3.635%

Principal amount

$ 1,000,000

Carrying amount

$ 988,720

988,500

Senior Notes | Somers Notes

Debt Instrument [Line Items]

Stated interest rate (percentage)

^[6]

Principal amount

Carrying amount

137,689

Somers Holdings Ltd. | Variable Interest Entity, Primary Beneficiary

Debt Instrument [Line Items]

Carrying amount

$ 172,689

Somers Holdings Ltd. | Variable Interest Entity, Primary Beneficiary | Senior Notes

Debt Instrument [Line Items]

Purchase of senior notes

$ 35,000

[1]	Senior notes of Arch Capital issued on May 4, 2004 and due May 1, 2034 (“2034 notes”).
[2]	Senior notes of Arch-U.S., a wholly-owned subsidiary of Arch Capital, issued on December 13, 2013 and due November 1, 2043 (“2043 notes”), fully and unconditionally guaranteed by Arch Capital.
[3]	Senior notes of Arch Capital Finance LLC (“Arch Finance”), a wholly-owned finance subsidiary of Arch Capital, issued on December 8, 2016 and due December 15, 2026 (“2026 notes”), fully and unconditionally guaranteed by Arch Capital.
[4]	Senior notes of Arch Finance issued on December 8, 2016 and due December 15, 2046 (“2046 notes”), fully and unconditionally guaranteed by Arch Capital
[5]	Senior notes of Arch Capital issued on June 30, 2020 and due June 30, 2050 (“2050 notes”).
[6]	Senior notes of Somers issued on July 2, 2019 and due July 2, 2029 (“Somers Senior Notes”), reflecting the elimination of amounts owned by Arch-U.S. Effective July 1, 2021, the Company no longer consolidates Somers in its financials.

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