CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Investments
Amortized Cost of Fixed Maturity Securities	$ 37,702.5	$ 37,386.7
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities	4.1	0.0
Allowance for credit losses for Mortgage Loans	8.4
Other Assets
Accounts and Premiums Receivable (net of allowance for credit losses of $34.3; $34.2)	1,563.9	1,519.9
Reinsurance Recoverable, Allowance for Credit Loss	$ 2.3	$ 2.3
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	308,132,633	307,334,853
Treasury Stock, Shares at Cost	107,899,280	104,820,670
Premium Receivable, Allowance for Credit Loss	$ 34.3	$ 34.2