Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues
Premiums and other considerations	$ 1,153.1	$ 1,932.9	$ 3,444.1	$ 3,657.8
Fees and other revenues	1,044.3	1,006.6	2,189.6	1,980.1
Net investment income (loss)	944.6	1,037.1	1,928.2	1,998.1
Net realized capital gains (losses)	(27.4)	(4.0)	104.0	80.5
Total revenues	3,114.6	3,972.6	7,665.9	7,716.5
Expenses
Benefits, claims and settlement expenses	1,601.3	2,446.1	4,460.0	4,641.2
Dividends to policyholders	31.4	29.9	60.3	60.0
Operating expenses	983.3	1,046.3	2,318.8	2,039.0
Total expenses	2,616.0	3,522.3	6,839.1	6,740.2
Income (loss) before income taxes	498.6	450.3	826.8	976.3
Income taxes (benefits)	82.5	58.2	125.7	132.1
Net income (loss)	416.1	392.1	701.1	844.2
Net income (loss) attributable to noncontrolling interest	17.8	5.8	13.9	28.0
Net income (loss) attributable to Principal Financial Group, Inc.	$ 398.3	$ 386.3	$ 687.2	$ 816.2
Earnings per common share
Basic earnings per common share (in dollars per share)	$ 1.45	$ 1.38	$ 2.50	$ 2.93
Diluted earnings per common share (in dollars per share)	$ 1.45	$ 1.37	$ 2.49	$ 2.90