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Debt - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021	Jul. 01, 2021
Debt Instrument [Line Items]
Debt instrument outstanding balance	$ 0	$ 0
Amount withdraw From revolving credit facilities			$ 125,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	200,000,000.0	$ 200,000,000.0
Debt instrument maturity date		Jun. 22, 2026
Debt instrument, frequency of commitment fee payable		quarterly
Amount withdraw From revolving credit facilities	0	$ 0
Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	1,500,000,000	$ 1,500,000,000
Maximum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, commitment fee percentage		0.225%
Maximum [Member] | LIBOR Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate margin		1.625%
Maximum [Member] | Base Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate margin		0.625%
Minimum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, commitment fee percentage		0.10%
Minimum [Member] | LIBOR Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate margin		1.00%
Minimum [Member] | Base Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate margin		0.00%
Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 600,000,000.0	$ 600,000,000.0
Debt instrument, interest rate, stated percentage	2.80%	2.80%
Debt instrument maturity date		Nov. 19, 2031
Unsecured Subordinated Note [Member] | Etelequote Bermuda [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 15,000,000.0
Surplus Note [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,400,000,000	$ 1,400,000,000
Debt instrument, interest rate, stated percentage	4.50%	4.50%
Debt instrument maturity date		Dec. 31, 2030

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-SubTopic 20
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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
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-SubTopic 20
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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.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

+ References

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-Topic 820
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-Section 50
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X

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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- Definition

Description of when the fee for available but unused credit capacity is required to be paid (for example, annually, quarterly, or monthly).

+ References

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

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