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Nature of Operations and Significant Accounting Policies - Unearned Revenue Liability (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Recent Accounting Pronouncements
Unearned Revenue Liability	$ 492.7	$ 467.4
Benefits and Protection | Life Insurance
Recent Accounting Pronouncements
Unearned Revenue Liability				$ 384.4
Universal life | Benefits and Protection | Life Insurance
Recent Accounting Pronouncements
Unearned Revenue Liability	$ 485.5	$ 459.0	$ 425.3	384.4
Previously reported | Benefits and Protection | Life Insurance
Recent Accounting Pronouncements
Unearned Revenue Liability				335.6
Previously reported | Universal life | Benefits and Protection | Life Insurance
Recent Accounting Pronouncements
Unearned Revenue Liability				335.6
Adjustment for reversal of unrealized gain (loss) from AOCI | ASU 2018-12 - Targeted improvements to the accounting for long-duration insurance contracts | Benefits and Protection | Life Insurance
Recent Accounting Pronouncements
Unearned Revenue Liability				48.8
Adjustment for reversal of unrealized gain (loss) from AOCI | ASU 2018-12 - Targeted improvements to the accounting for long-duration insurance contracts | Universal life | Benefits and Protection | Life Insurance
Recent Accounting Pronouncements
Unearned Revenue Liability				$ 48.8

X

- Definition

Represents collected fees or other policyholder assessments, inclusive of cost of insurance charges, administrative charges and other similar fees, for services to be provided in future periods.

+ References

No definition available.

+ Details

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Namespace Prefix:	pfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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