Condensed Consolidated Statements of Financial Position - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets
Fixed maturities, available-for-sale	$ 76,557.1	$ 78,710.3
Fixed maturities, trading	413.5	532.1
Equity securities (2021 and 2020 include $789.1 million and $902.5 million related to consolidated variable interest entities)	2,428.2	2,013.4
Mortgage loans (2021 and 2020 include $1,334.1 million and $319.0 million related to consolidated variable interest entities)	19,426.0	17,343.0
Real estate (2021 and 2020 include $653.3 million and $476.8 million related to consolidated variable interest entities)	1,965.6	1,797.3
Policy loans	762.1	784.0
Other investments (2021 and 2020 include $437.5 million and $348.5 million related to consolidated variable interest entities and $0.0 million and $28.5 million measured at fair value under the fair value option)	5,341.9	5,126.8
Total investments	106,894.4	106,306.9
Cash and cash equivalents (2021 and 2020 include $52.1 million and $28.8 million related to consolidated variable interest entities)	3,145.4	2,849.8
Accrued investment income	727.7	710.6
Premiums due and other receivables	1,713.2	1,723.8
Deferred acquisition costs	3,696.9	3,409.7
Property and equipment	1,065.4	1,019.0
Goodwill	1,648.4	1,711.0
Other intangibles	1,629.4	1,723.0
Separate account assets (2021 and 2020 include $34,420.2 million and $41,138.9 million related to consolidated variable interest entities)	177,850.5	175,951.4
Other assets	537.1	1,222.5
Total assets	298,908.4	296,627.7
Liabilities
Contractholder funds (2021 and 2020 include $350.7 million and $388.6 million related to consolidated variable interest entities)	43,828.9	43,237.7
Future policy benefits and claims	43,784.0	45,207.2
Other policyholder funds	1,063.8	1,059.4
Short-term debt	74.3	84.7
Long-term debt	4,279.7	4,279.2
Income taxes currently payable	8.2	22.3
Deferred income taxes	2,345.6	2,330.8
Separate account liabilities (2021 and 2020 include $34,420.2 million and $41,138.9 million related to consolidated variable interest entities)	177,850.5	175,951.4
Other liabilities (2021 and 2020 include $55.6 million and $24.5 million related to consolidated variable interest entities)	9,200.9	7,582.1
Total liabilities	282,435.9	279,754.8
Redeemable noncontrolling interest (2021 and 2020 include $309.7 million and $226.8 million related to consolidated variable interest entities)	343.3	255.6
Stockholders' equity
Common stock, par value $0.01 per share; 2,500.0 million shares authorized; 484.3 million and 481.9 million shares issued as of 2021 and 2020; 266.1 million and 273.3 million shares outstanding as of 2021 and 2020	4.8	4.8
Additional paid-in capital	10,436.5	10,321.6
Retained earnings	12,583.9	11,838.0
Accumulated other comprehensive income (loss)	1,619.2	2,383.1
Treasury stock, at cost (218.2 million and 208.6 million shares as of 2021 and 2020)	(8,573.7)	(7,988.6)
Total stockholders' equity attributable to Principal Financial Group, Inc.	16,070.7	16,558.9
Noncontrolling interest	58.5	58.4
Total stockholders' equity	16,129.2	16,617.3
Total liabilities and stockholders' equity	$ 298,908.4	$ 296,627.7