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Condensed Consolidated Statements of Financial Position (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Equity securities	$ 2,526.3	$ 2,013.4
Mortgage loans	18,177.2	17,343.0
Real estate	1,833.4	1,797.3
Other investments	5,216.5	5,126.8
Other investments measured at fair value under fair value option	37.8	28.5
Separate account assets	177,829.0	175,951.4
Contractholder funds	43,082.1	43,237.7
Separate account liabilities	177,829.0	175,951.4
Other liabilities	7,784.7	7,582.1
Redeemable noncontrolling interest	$ 263.5	$ 255.6
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)	483.3	481.9
Common stock, outstanding (in shares)	272.5	273.3
Treasury stock (in shares)	210.8	208.6
Aggregate consolidated variable interest entities
Equity securities	$ 873.6	$ 902.5
Mortgage loans	684.9	319.0
Real estate	513.4	476.8
Other investments	362.2	348.5
Separate account assets	40,798.1	41,138.9
Contractholder funds	378.6	388.6
Separate account liabilities	40,798.1	41,138.9
Other liabilities	44.7	24.5
Redeemable noncontrolling interest	$ 226.8	$ 226.8

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