CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Investments
Amortized Cost of Fixed Maturity Securities	$ 37,355.0	$ 36,546.5
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities	0.0	6.8
Allowance for credit losses for Mortgage Loans	11.3	13.1
Other Assets
Accounts Receivable, after Allowance for Credit Loss	32.6	38.8
Reinsurance Recoverable, Allowance for Credit Loss	$ 2.3	$ 11.7
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	307,282,297	306,566,572
Treasury Stock, Shares at Cost	102,876,514	102,876,514