Condensed Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fixed maturities, trading	$ 877.7	$ 836.2
Equity securities	1,488.9	1,478.1
Mortgage loans	20,294.5	20,142.8
Real estate	2,363.5	2,345.3
Other investments	7,378.2	7,035.6
Cash and cash equivalents	4,168.4	4,707.7
Other investments measured at fair value under fair value option	163.9	163.2
Separate account assets	171,788.2	167,605.6
Contractholder funds	42,004.4	41,501.1
Separate account liabilities	171,788.2	167,605.6
Other liabilities	11,434.8	11,606.2
Redeemable noncontrolling interest	$ 370.8	$ 248.9
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)	493,795,133	492,279,405
Common stock, outstanding (in shares)	235,032,781	236,438,294
Treasury stock (in shares)	258,762,352	255,841,111
Aggregate consolidated variable interest entities
Fixed maturities, trading	$ 187.8	$ 81.2
Equity securities	369.4	394.4
Mortgage loans	856.9	871.9
Real estate	829.0	779.1
Other investments	734.5	596.4
Cash and cash equivalents	75.6	83.6
Separate account assets	32,516.4	34,688.3
Separate account liabilities	32,516.4	34,688.3
Other liabilities	79.4	87.7
Redeemable noncontrolling interest	$ 343.9	$ 226.4