CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Investments
Amortized Cost of Fixed Maturity Securities	$ 36,546.5	$ 41,079.3
Debt Securities, Available-for-sale, Allowance for Credit Loss for Fixed Maturity Securities	6.8	0.0
Allowance for credit losses for Mortgage Loans	13.1	0.0
Other Assets
Accounts Receivable, after Allowance for Credit Loss	38.8	10.3
Reinsurance Recoverable, Allowance for Credit Loss	$ 11.7	$ 0.0
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	306,566,572	305,813,326
Treasury Stock, Shares at Cost	102,876,514	102,876,514