CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Investments
Amortized Cost of Fixed Maturity Securities	$ 37,386.7	$ 36,546.5
Debt Securities, Available-for-sale, Allowance for Credit Loss for Fixed Maturity Securities	0.0	6.8
Allowance for credit losses for Mortgage Loans	8.3	13.1
Other Assets
Accounts Receivable, after Allowance for Credit Loss	34.2	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	307,334,853	306,566,572
Treasury Stock, Shares at Cost	104,820,670	102,876,514