CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Investments
Amortized Cost of Fixed Maturity Securities	$ 38,101.8	$ 37,825.2
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities	0.0	0.0
Other Assets
Accounts Receivable, after Allowance for Credit Loss	31.6	32.5
Reinsurance Recoverable, Allowance for Credit Loss	$ 3.9	$ 1.7
Stockholders' Equity
Common Stock, Par Value (in dollars per share)	$ 0.10	$ 0.10
Common Stock, Shares Authorized	725,000,000	725,000,000
Common Stock, Shares Issued	309,222,758	308,306,490
Treasury Stock, Shares at Cost	111,857,500	110,551,977