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Fair Value of Financial Instruments - Other Assets Measured at Fair Value on a Nonrecurring Basis (Details) $ in Millions		3 Months Ended	12 Months Ended
	Jul. 01, 2021 USD ($)	Dec. 31, 2023 USD ($) property	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) property
Carrying value and estimated fair value of financial instruments
Other real estate, fair value		$ 84.7		$ 82.9
Number of properties | property		300		388
Equity method investments		$ 19.8
Lima One
Carrying value and estimated fair value of financial instruments
Impairment and other net gain/(loss) on securities and other portfolio investments	$ 38.9		$ 38.9
Level 3 | Residential Whole Loans
Carrying value and estimated fair value of financial instruments
Loans, fair value		13.6
Loss from changes in fair value		$ 1.2
Entity Owning a Newly Constructed Industrial Property
Carrying value and estimated fair value of financial instruments
Ownership percentage		75.00%
Equity method investments		$ 25.7
Commercial Real Estate Owned
Carrying value and estimated fair value of financial instruments
Other real estate, fair value		$ 34.2
Number of properties | property		1

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The revenues and gains recognized recorded for each transaction with the acquiree that is recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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.

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No definition available.

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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The number of real estate properties owned as of the balance sheet date.

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