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Derivative Financial Instruments - Credit Derivatives Sold (Details) - Single name credit default swaps - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Credit derivatives sold disclosures
Notional amount	$ 220.0	$ 270.0
Fair value	4.5	2.6
Maximum future payments	$ 220.0	$ 270.0
Weighted average expected life	2 years 8 months 12 days	3 years 1 month 6 days
Corporate debt securities | A
Credit derivatives sold disclosures
Notional amount	$ 40.0	$ 40.0
Fair value	0.3	0.4
Maximum future payments	$ 40.0	$ 40.0
Weighted average expected life	1 year 6 months	2 years 6 months
Corporate debt securities | BBB
Credit derivatives sold disclosures
Notional amount	$ 140.0	$ 190.0
Fair value	3.8	2.2
Maximum future payments	$ 140.0	$ 190.0
Weighted average expected life	3 years	3 years 1 month 6 days
Corporate debt securities | BB
Credit derivatives sold disclosures
Notional amount	$ 20.0	$ 20.0
Fair value	0.2	(0.2)
Maximum future payments	$ 20.0	$ 20.0
Weighted average expected life	3 years 6 months	4 years 6 months
Sovereign | A
Credit derivatives sold disclosures
Notional amount	$ 20.0	$ 20.0
Fair value	0.2	0.2
Maximum future payments	$ 20.0	$ 20.0
Weighted average expected life	1 year 6 months	2 years 6 months

X

- Definition

Discloses the notional amount of the credit derivatives sold (or each group of similar credit derivatives) as of the date of the statement of financial position.

+ References

No definition available.

+ Details

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

X

- Definition

Discloses the fair value of the credit derivatives sold (or each group of similar credit derivatives) as of the date of the statement of financial position.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the weighted-average expected life in years for credit derivatives sold.

+ References

No definition available.

+ Details

Name:	pfg_CreditDerivativesSoldWeightedAverageExpectedLife
Namespace Prefix:	pfg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4K
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4K

+ Details

Name:	us-gaap_CreditDerivativeMaximumExposureUndiscounted
Namespace Prefix:	us-gaap_
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.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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Data Type:	na
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X

- Details

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Namespace Prefix:
Data Type:	na
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X

- Details

Name:	srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsBBBRatingMember
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- Details

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X

- Details

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