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Reinsurance (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($) item	Dec. 31, 2021 USD ($) item
Ceded Credit Risk [Line Items]
Net ceded reinsurance recoverables	$ 14,121.2	$ 1,186.5
Reinsurance deposit receivable	9,479.9
Reinsurer Concentration Risk | Net ceded reinsurance recoverables | Five largest ceded reinsurers
Ceded Credit Risk [Line Items]
Net ceded reinsurance recoverables	$ 13,636.4	$ 578.0
Concentration risk percentage	99.80%	95.50%
Number of largest ceded reinsurers | item	5	5

X

- Definition

Amount, after valuation allowance, of recoverable amounts under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves, that have been ceded to other entities.

+ References

No definition available.

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X

- Definition

The unaccreted deposit balance for reinsurance agreements for which we use the deposit method of accounting.

+ References

No definition available.

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- Definition

The number of ceded reinsurers for which the amount of net ceded reinsurance recoverables related to claims received is disclosed as a concentration of credit risk.

+ References

No definition available.

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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

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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