Consolidated Statements of Financial Position - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Assets
Fixed maturities, available-for-sale (2018 and 2017 include $94.5 million and $268.0 million related to consolidated variable interest entities)	$ 60,108.5	$ 59,388.4
Fixed maturities, trading	636.1	566.0
Equity securities (2018 and 2017 include $774.8 million and $811.4 million related to consolidated variable interest entities)	1,843.7	1,866.6
Mortgage loans	15,336.9	14,150.5
Real estate (2018 and 2017 include $364.0 million and $370.3 million related to consolidated variable interest entities)	1,729.7	1,736.7
Policy loans	801.4	808.3
Other investments (2018 and 2017 include $457.9 million and $139.8 million related to consolidated variable interest entities and $23.6 million and $61.0 million measured at fair value under the fair value option)	4,310.3	3,586.2
Total investments	84,766.6	82,102.7
Cash and cash equivalents	2,977.5	2,470.8
Accrued investment income	636.2	610.6
Premiums due and other receivables	1,413.1	1,469.8
Deferred acquisition costs	3,693.5	3,540.7
Property and equipment	767.3	759.5
Goodwill	1,100.0	1,068.8
Other intangibles	1,315.1	1,314.7
Separate account assets (2018 and 2017 include $37,183.3 million and $41,540.8 million related to consolidated variable interest entities)	144,987.9	159,272.7
Other assets	1,378.9	1,330.9
Total assets	243,036.1	253,941.2
Liabilities
Contractholder funds (2018 and 2017 include $396.0 million and $380.6 million related to consolidated variable interest entities)	39,699.7	38,082.5
Future policy benefits and claims	35,664.8	33,019.3
Other policyholder funds	888.4	922.3
Short-term debt	42.9	39.5
Long-term debt (2018 and 2017 include $58.4 million and $2.8 million related to consolidated variable interest entities)	3,259.6	3,178.4
Income taxes currently payable	25.3	16.7
Deferred income taxes	958.4	1,092.5
Separate account liabilities (2018 and 2017 include $37,183.3 million and $41,540.8 million related to consolidated variable interest entities)	144,987.9	159,272.7
Other liabilities (2018 and 2017 include $104.9 million and $270.2 million related to consolidated variable interest entities)	5,661.9	5,294.1
Total liabilities	231,188.9	240,918.0
Redeemable noncontrolling interest (2018 and 2017 include $325.7 million and $52.4 million related to consolidated variable interest entities)	391.2	101.3
Stockholders' equity
Common stock, par value $.01 per share - 2,500.0 million shares authorized, 476.7 million and 474.1 million shares issued, and 279.5 million and 289.0 million shares outstanding in 2018 and 2017	4.8	4.7
Additional paid-in capital	10,060.7	9,925.2
Retained earnings (accumulated deficit)	10,290.2	9,482.9
Accumulated other comprehensive income (loss)	(1,565.1)	165.5
Treasury stock, at cost (197.2 million and 185.1 million shares in 2018 and 2017)	(7,400.6)	(6,729.0)
Total stockholders' equity attributable to Principal Financial Group, Inc.	11,390.0	12,849.3
Noncontrolling interest	66.0	72.6
Total stockholders' equity	11,456.0	12,921.9
Total liabilities and stockholders' equity	$ 243,036.1	$ 253,941.2