CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Investments:
Fixed maturities, available for sale, amortized cost	$ 19,641.6	$ 19,179.5
Fixed maturities, available for sale, allowance for credit losses	10.8	2.1
Equity securities, cost	68.5	44.2
Mortgage loans, allowance for credit losses	11.6	6.7
Investments held by variable interest entities, amortized cost	1,223.7	$ 1,206.3
Investments held by variable interest entities, allowance for credit losses	27.7
Reinsurance receivables, allowance for current expected credit losses	$ 4.0
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	8,000,000,000	8,000,000,000
Common stock, shares issued (in shares)	141,718,570	148,084,178
Common stock, shares outstanding (in shares)	141,718,570	148,084,178