Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Amortized cost of fixed maturities	$ 7,565.8	$ 7,811.8
Allowance for credit loss, available for sale	8.2	9.6
Allowance for credit losses	(8.2)	(9.6)
Cost of equity securities	209.3	247.6
Premium Receivable, Allowance for Credit Loss	13.9	13.1
Long-term Debt	$ 1,213.4	$ 1,195.1
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares outstanding (in shares)	64,111,555	63,912,762
Receivables from Policyholders (Allowance for Credit Losses: 2023 - $13.9; 2022 - $13.1)	$ 959.5	$ 1,286.6	[1]
Deferred Policy Acquisition Costs	591.6	635.6	[1]
Deferred Income Tax Assets	210.4	129.0	[1]
Variable Interest Entity, Primary Beneficiary
Amortized cost of fixed maturities	1.7	0.0
Allowance for credit loss, available for sale	0.0	0.0
Allowance for credit losses	0.0	0.0
Receivables from Policyholders (Allowance for Credit Losses: 2023 - $13.9; 2022 - $13.1)	0.7	0.0	[1]
Deferred Policy Acquisition Costs	0.1	0.0
Deferred Income Tax Assets	0.1	0.0
Consolidated Entity, Excluding Consolidated VIE
Amortized cost of fixed maturities	7,565.8	7,811.8
Allowance for credit loss, available for sale	8.2	9.6
Allowance for credit losses	$ (8.2)	$ (9.6)

[1] As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been recast to reflect application of the new guidance. See Note 2 to the Consolidated Financial Statements for additional information.