Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues
Premiums and other considerations	$ 1,230.5	$ 1,184.3	$ 3,335.3	$ 4,628.4
Fees and other revenues	1,251.8	1,143.0	3,711.0	3,332.6
Net investment income (loss)	1,093.4	917.9	3,167.0	2,846.1
Net realized capital gains (losses)	(152.0)	65.5	(41.7)	169.5
Total revenues	3,423.7	3,310.7	10,171.6	10,976.6
Expenses
Benefits, claims and settlement expenses	1,770.9	1,839.8	4,958.4	6,299.8
Dividends to policyholders	28.2	29.9	75.3	90.2
Operating expenses	1,196.5	1,165.9	3,663.3	3,484.7
Total expenses	2,995.6	3,035.6	8,697.0	9,874.7
Income (loss) before income taxes	428.1	275.1	1,474.6	1,101.9
Income taxes (benefits)	63.8	39.2	222.4	164.9
Net income (loss)	364.3	235.9	1,252.2	937.0
Net income (loss) attributable to noncontrolling interest	4.4	(0.1)	13.4	13.8
Net income (loss) attributable to Principal Financial Group, Inc.	$ 359.9	$ 236.0	$ 1,238.8	$ 923.2
Earnings per common share
Basic earnings per common share (in dollars per share)	$ 1.34	$ 0.86	$ 4.58	$ 3.36
Diluted earnings per common share (in dollars per share)	$ 1.32	$ 0.85	$ 4.51	$ 3.34