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Derivative Financial Instruments - Credit Derivatives Sold (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Credit derivatives sold disclosures
Notional amount	$ 573.3	$ 470.0
Fair value	1.1	17.4
Maximum future payments	$ 573.3	$ 470.0
Weighted average expected life	13 years 8 months 12 days	15 years 10 months 24 days
Single name credit default swaps
Credit derivatives sold disclosures
Notional amount	$ 323.3	$ 220.0
Fair value	3.1	3.9
Maximum future payments	$ 323.3	$ 220.0
Weighted average expected life	2 years 6 months	1 year 8 months 12 days
Single name credit default swaps | Corporate debt securities | AA
Credit derivatives sold disclosures
Notional amount	$ 56.7
Fair value	0.2
Maximum future payments	$ 56.7
Weighted average expected life	4 years 8 months 12 days
Single name credit default swaps | Corporate debt securities | A
Credit derivatives sold disclosures
Notional amount	$ 86.6	$ 40.0
Fair value	(0.3)	0.2
Maximum future payments	$ 86.6	$ 40.0
Weighted average expected life	2 years 7 months 6 days	6 months
Single name credit default swaps | Corporate debt securities | BBB
Credit derivatives sold disclosures
Notional amount	$ 160.0	$ 160.0
Fair value	3.2	3.6
Maximum future payments	$ 160.0	$ 160.0
Weighted average expected life	1 year 9 months 18 days	2 years 1 month 6 days
Single name credit default swaps | Sovereign | A
Credit derivatives sold disclosures
Notional amount	$ 20.0	$ 20.0
Fair value		0.1
Maximum future payments	$ 20.0	$ 20.0
Weighted average expected life	2 months 12 days	6 months
Single name total return swaps
Credit derivatives sold disclosures
Notional amount	$ 250.0	$ 250.0
Fair value	(2.0)	13.5
Maximum future payments	$ 250.0	$ 250.0
Weighted average expected life	28 years 2 months 12 days	28 years 6 months
Single name total return swaps | Government/municipalities | AAA
Credit derivatives sold disclosures
Notional amount	$ 40.0	$ 40.0
Fair value	(0.5)	2.3
Maximum future payments	$ 40.0	$ 40.0
Weighted average expected life	30 years 3 months 18 days	30 years 7 months 6 days
Single name total return swaps | Government/municipalities | AA
Credit derivatives sold disclosures
Notional amount	$ 130.0	$ 130.0
Fair value	(1.8)	6.4
Maximum future payments	$ 130.0	$ 130.0
Weighted average expected life	26 years 2 months 12 days	26 years 6 months
Single name total return swaps | Government/municipalities | A
Credit derivatives sold disclosures
Notional amount	$ 80.0	$ 80.0
Fair value	0.3	4.8
Maximum future payments	$ 80.0	$ 80.0
Weighted average expected life	30 years 4 months 24 days	30 years 8 months 12 days

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

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Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	pfg_
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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

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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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- Details

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