Condensed Consolidated Statements of Financial Position (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Equity securities	$ 2,260.4	$ 2,347.2
Mortgage loans	20,542.7	19,668.7
Real estate	2,139.6	2,075.4
Other investments	5,645.1	5,478.3
Cash and Cash Equivalents, at Carrying Value	2,741.2	2,332.0
Separate account assets	173,516.3	182,345.4
Contractholder funds	44,027.4	43,598.0
Separate account liabilities	173,516.3	182,345.4
Other liabilities	11,052.9	10,540.7
Redeemable noncontrolling interest	$ 306.8	$ 332.5
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	2,500.0	2,500.0
Common stock, issued (in shares)	486.6	484.9
Common stock, outstanding (in shares)	252.2	261.7
Treasury stock (in shares)	234.4	223.2
Aggregate consolidated variable interest entities
Equity securities	$ 770.5	$ 783.7
Mortgage loans	1,574.7	1,260.1
Real estate	609.2	672.0
Other investments	480.1	522.8
Cash and Cash Equivalents, at Carrying Value	52.4	49.6
Separate account assets	34,725.7	33,957.7
Contractholder funds	339.1	344.0
Separate account liabilities	34,725.7	33,957.7
Other liabilities	79.2	58.7
Redeemable noncontrolling interest	$ 278.3	$ 304.0