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Revenues from Contracts with Customers - Disaggregation within Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from Contracts with Customers - Disaggregation of Revenues
Total fees and other revenues	$ 5,012.6	$ 4,511.1	$ 4,409.9
Premiums and other considerations	4,841.5	6,037.4	7,866.6
Net investment income (loss)	4,406.1	3,890.6	3,998.4
Retirement and Income Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Premiums and other considerations	1,883.6	3,221.0	4,862.7
Net investment income (loss)	2,674.4	2,457.9	2,420.4
Principal Global Investors
Revenues from Contracts with Customers - Disaggregation of Revenues
Net investment income (loss)	3.9	5.6	10.1
Principal International
Revenues from Contracts with Customers - Disaggregation of Revenues
Premiums and other considerations	127.5	156.6	393.3
Net investment income (loss)	631.1	446.8	575.9
U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Premiums and other considerations	2,830.4	2,659.8	2,610.6
Net investment income (loss)	917.1	850.6	854.5
Corporate
Revenues from Contracts with Customers - Disaggregation of Revenues
Net investment income (loss)	179.6	129.7	137.5
Operating Segments
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	3,150.1	2,768.3	2,610.0
Total operating revenues	14,458.2	14,579.9	16,393.1
Operating Segments | Retirement and Income Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	590.1	599.8	464.8
Total operating revenues	6,510.0	7,503.5	8,954.4
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Fee
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	580.2	591.2	455.5
Fees and other revenues not within the scope of revenue recognition guidance	1,299.6	1,130.4	1,139.0
Total fees and other revenues	1,879.8	1,721.6	1,594.5
Premiums and other considerations	0.5	5.0	3.5
Net investment income (loss)	442.4	423.2	405.0
Total operating revenues	2,322.7	2,149.8	2,003.0
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Fee | Administrative service fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	576.7	589.2	453.7
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Fee | Other fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	3.5	2.0	1.8
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Spread
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	9.9	8.6	9.3
Fees and other revenues not within the scope of revenue recognition guidance	7.9	9.5	13.9
Total fees and other revenues	17.8	18.1	23.2
Premiums and other considerations	1,883.1	3,216.0	4,859.2
Net investment income (loss)	2,286.4	2,119.6	2,069.0
Total operating revenues	4,187.3	5,353.7	6,951.4
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Spread | Deposit account fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	9.2	8.4	9.3
Operating Segments | Retirement and Income Solutions | Retirement and Income Solutions - Spread | Commission income
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	0.7	0.2
Operating Segments | Principal Global Investors
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	1,787.9	1,511.2	1,456.7
Fees and other revenues not within the scope of revenue recognition guidance	36.2	22.3	38.5
Total fees and other revenues	1,824.1	1,533.5	1,495.2
Net investment income (loss)	3.9	5.6	10.6
Total operating revenues	1,828.0	1,539.1	1,505.8
Operating Segments | Principal Global Investors | Management fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	1,514.1	1,298.4	1,239.1
Operating Segments | Principal Global Investors | Other fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	273.8	212.8	217.6
Operating Segments | Principal International
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	492.7	439.2	462.2
Fees and other revenues not within the scope of revenue recognition guidance	4.1	5.6	6.3
Total fees and other revenues	496.8	444.8	468.5
Premiums and other considerations	127.5	156.6	393.3
Net investment income (loss)	727.5	495.4	661.4
Total operating revenues	1,351.8	1,096.8	1,523.2
Operating Segments | Principal International | Latin America
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	362.6	323.5	351.5
Operating Segments | Principal International | Asia
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	128.8	115.9	111.0
Operating Segments | Principal International | Principal International Corporate / Regional Office
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	2.6	0.9	0.9
Operating Segments | Principal International | Geographical Eliminations
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	(1.3)	(1.1)	(1.2)
Operating Segments | Principal International | Management fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	484.4	435.3	459.3
Operating Segments | Principal International | Other fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	8.3	3.9	2.9
Operating Segments | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	75.3	63.2	65.9
Total operating revenues	4,766.6	4,480.2	4,449.0
Operating Segments | U.S. Insurance Solutions | Specialty Benefits insurance
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	14.9	14.8	14.9
Fees and other revenues not within the scope of revenue recognition guidance	19.0	19.3	19.6
Total fees and other revenues	33.9	34.1	34.5
Premiums and other considerations	2,496.4	2,330.7	2,292.7
Net investment income (loss)	179.3	160.6	166.4
Total operating revenues	2,709.6	2,525.4	2,493.6
Operating Segments | U.S. Insurance Solutions | Specialty Benefits insurance | Administrative service fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	14.9	14.8	14.9
Operating Segments | U.S. Insurance Solutions | Individual Life insurance
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	60.6	48.6	51.2
Fees and other revenues not within the scope of revenue recognition guidance	859.2	849.8	875.9
Total fees and other revenues	919.8	898.4	927.1
Premiums and other considerations	334.0	329.1	317.9
Net investment income (loss)	803.4	727.5	710.6
Total operating revenues	2,057.2	1,955.0	1,955.6
Operating Segments | U.S. Insurance Solutions | Individual Life insurance | Administrative service fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	26.7	21.8	24.3
Operating Segments | U.S. Insurance Solutions | Individual Life insurance | Commission income
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	33.9	26.8	26.9
Operating Segments | Corporate
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	204.1	154.9	160.4
Fees and other revenues not within the scope of revenue recognition guidance	(360.0)	(303.9)	(301.8)
Total fees and other revenues	(155.9)	(149.0)	(141.4)
Net investment income (loss)	157.7	109.3	102.1
Total operating revenues	1.8	(39.7)	(39.3)
Operating Segments | Corporate | Other fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	68.8	59.1	46.1
Operating Segments | Corporate | Commission income
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	388.9	316.6	320.2
Operating Segments | Corporate | Revenue by type - Eliminations
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	$ (253.6)	$ (220.8)	$ (205.9)

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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