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Investments - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	$ 1,632.2
Financing Receivable, Accrued Interest, before Allowance for Credit Loss	75.4		$ 77.0
Fixed maturities, allowance for credit losses	(7.5)	$ 7.1	(8.2)	$ 9.6
Equity securities without readily determinable fair value, impairment loss, cumulative amount	$ 4.8		8.0
Percentage of Equity Method Limited Liability Investments reported with a lag	3.30%
Percentage of Equity Method Limited Liability Investments reported with a One Month Lag	4.70%
Loans to Policyholders	$ 279.8		281.2
Equity securities, FV-NI, unrealized gain (loss)	(0.6)	9.8
Equity Securities
Debt Securities, Available-for-sale [Line Items]
Other than Temporary Impairment Losses, Investments	0.4
Government National Mortgage Association Certificates and Obligations (GNMA)
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	219.1
Federal National Mortgage Association Certificates and Obligations (FNMA)
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	93.4
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC)
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	61.2
Other Non-Governmental Issuers
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	1,258.5
Investments in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, unrealized loss position, accumulated loss	880.4		730.3
12 Months or Longer	851.0		721.2
Other Receivables	3.6		0.9
Other liabilities	18.9		0.0
Equity Securities
Debt Securities, Available-for-sale [Line Items]
Other Receivables	0.0		0.1
Corporate Bonds and Notes
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, unrealized loss position, accumulated loss	509.9		383.8
12 Months or Longer	487.0		378.3
Fixed maturities, allowance for credit losses	(7.2)	$ 6.7	(7.7)	$ 8.9
Equity Method Investments
Debt Securities, Available-for-sale [Line Items]
Other liabilities	0.0		0.0
Variable Interest Entity, Not Primary Beneficiary
Debt Securities, Available-for-sale [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	17.3		17.3
Consolidated Entity, Excluding VIE
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, allowance for credit losses	(7.5)		(8.2)
Equity securities	226.6		225.8
Other Receivables	191.5		200.5
Equity Securities, FV-NI, Current	226.6		225.8
Loans to Policyholders	279.8		281.2
Consolidated Entity, Excluding VIE | Equity Method Limited Liability Investments
Debt Securities, Available-for-sale [Line Items]
Equity Method Investments	205.1		221.7
Consolidated Entity, Excluding VIE | Alternative Energy Partnership Investments
Debt Securities, Available-for-sale [Line Items]
Equity Method Investments	17.3		17.3
Variable Interest Entity, Not Primary Beneficiary | Equity Method Limited Liability Investments
Debt Securities, Available-for-sale [Line Items]
Outstanding commitments to fund equity method limited liability investments	80.8
External Credit Rating, Investment Grade [Member] | Investments in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, unrealized loss position, accumulated loss	862.8		704.8
Non-investment-grade | Investments in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, unrealized loss position, accumulated loss	$ 17.6		$ 25.5
Percentage of unrealized loss position to amortized cost basis of available for sale security average	5.40%		8.80%

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