Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fixed maturities, trading	$ 836.2	$ 760.7
Equity securities	1,478.1	1,708.6
Mortgage loans	20,142.8	20,629.8
Real estate	2,345.3	2,239.7
Other investments	7,035.6	6,122.0
Cash and cash equivalents	4,707.7	4,848.0
Other investments measured at fair value under fair value option	163.2	0.0
Separate account assets	167,605.6	155,375.1
Contractholder funds	41,501.1	42,825.3
Separate account liabilities	167,605.6	155,375.1
Other liabilities	11,606.2	12,096.7
Redeemable noncontrolling interest	$ 248.9	$ 262.0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	2,500,000,000	2,500,000,000
Common stock, issued (in shares)	492,279,405	489,809,564
Common stock, outstanding (in shares)	236,438,294	243,549,782
Treasury stock (in shares)	255,841,111	246,259,782
Aggregate consolidated variable interest entities
Fixed maturities, trading	$ 81.2	$ 27.8
Equity securities	394.4	740.0
Mortgage loans	871.9	1,179.7
Real estate	779.1	649.0
Other investments	596.4	375.9
Cash and cash equivalents	83.6	32.4
Separate account assets	34,688.3	34,193.8
Contractholder funds	0.0	334.0
Separate account liabilities	34,688.3	34,193.8
Other liabilities	87.7	86.8
Redeemable noncontrolling interest	$ 226.4	$ 235.3