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Revenues from Contracts with Customers - Disaggregation within Segments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues from Contracts with Customers - Disaggregation of Revenues
Total fees and other revenues	$ 1,193.9	$ 1,145.3
Premiums and other considerations	835.1	2,291.0
Net investment income (loss)	1,028.1	983.6
Operating Segments
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	738.1	700.4
Total operating revenues	3,113.5	4,429.6
Operating Segments | Retirement and Income Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	144.3	158.5
Total operating revenues	1,224.0	2,605.7
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	141.9	156.4
Fees and other revenues not within the scope of revenue recognition guidance	313.7	280.5
Total fees and other revenues	455.6	436.9
Premiums and other considerations	0.5	1.8
Net investment income (loss)	107.0	104.4
Total operating revenues	563.1	543.1
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	141.8	156.2
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	0.1	0.2
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	2.4	2.1
Fees and other revenues not within the scope of revenue recognition guidance	2.0	3.1
Total fees and other revenues	4.4	5.2
Premiums and other considerations	104.8	1,521.1
Net investment income (loss)	551.7	536.3
Total operating revenues	660.9	2,062.6
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	2.3	2.1
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	0.1
Operating Segments | Principal Global Investors
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	406.1	382.9
Fees and other revenues not within the scope of revenue recognition guidance	8.0	5.5
Total fees and other revenues	414.1	388.4
Net investment income (loss)	1.1	2.4
Total operating revenues	415.2	390.8
Operating Segments | Principal Global Investors | Management fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	355.9	321.0
Operating Segments | Principal Global Investors | Other fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	50.2	61.9
Operating Segments | Principal International
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	121.9	109.5
Fees and other revenues not within the scope of revenue recognition guidance	1.0	1.3
Total fees and other revenues	122.9	110.8
Premiums and other considerations	27.3	85.0
Net investment income (loss)	157.8	104.7
Total operating revenues	308.0	300.5
Operating Segments | Principal International | Latin America
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	89.1	81.5
Operating Segments | Principal International | Asia
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	32.3	28.0
Operating Segments | Principal International | Principal International Corporate / Regional Office
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	0.8	0.2
Operating Segments | Principal International | Geographical Eliminations
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	(0.3)	(0.2)
Operating Segments | Principal International | Management fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	120.1	108.5
Operating Segments | Principal International | Other fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	1.8	1.0
Operating Segments | U.S. Insurance Solutions
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	17.4	16.6
Total operating revenues	1,174.9	1,123.3
Operating Segments | U.S. Insurance Solutions | Specialty Benefits insurance
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	3.7	3.8
Fees and other revenues not within the scope of revenue recognition guidance	4.8	4.9
Total fees and other revenues	8.5	8.7
Premiums and other considerations	605.3	588.4
Net investment income (loss)	41.8	41.9
Total operating revenues	655.6	639.0
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	3.7	3.8
Operating Segments | U.S. Insurance Solutions | Individual Life insurance
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	13.7	12.8
Fees and other revenues not within the scope of revenue recognition guidance	220.2	210.0
Total fees and other revenues	233.9	222.8
Premiums and other considerations	97.2	94.7
Net investment income (loss)	188.2	166.8
Total operating revenues	519.3	484.3
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	5.9	5.7
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	7.8	7.1
Operating Segments | Corporate
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	48.4	32.9
Fees and other revenues not within the scope of revenue recognition guidance	(86.0)	(76.1)
Total fees and other revenues	(37.6)	(43.2)
Net investment income (loss)	29.0	52.5
Total operating revenues	(8.6)	9.3
Operating Segments | Corporate | Other fee revenue
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	16.3	11.1
Operating Segments | Corporate | Commission income
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	92.0	80.4
Operating Segments | Corporate | Revenue by type - Eliminations
Revenues from Contracts with Customers - Disaggregation of Revenues
Total revenues from contracts with customers	$ (59.9)	$ (58.6)

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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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