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Derivative Financial Instruments - Credit Derivatives Sold (Details) - Single name credit default swaps - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Credit derivatives sold disclosures |  |
Notional amount | $ 170.0 | $ 170.0
Fair value | 3.1 | 3.3
Maximum future payments | $ 170.0 | $ 170.0
Weighted average expected life | 3 years 6 months | 3 years 9 months 18 days
Corporate debt securities | A |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 20.0 | $ 20.0
Fair value | 0.5 | 0.5
Maximum future payments | $ 20.0 | $ 20.0
Weighted average expected life | 4 years 2 months 12 days | 4 years 6 months
Corporate debt securities | BBB |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 115.0 | $ 115.0
Fair value | 2.0 | 2.1
Maximum future payments | $ 115.0 | $ 115.0
Weighted average expected life | 3 years 7 months 6 days | 3 years 10 months 24 days
Sovereign | A |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 20.0 | $ 20.0
Fair value | 0.5 | 0.6
Maximum future payments | $ 20.0 | $ 20.0
Weighted average expected life | 4 years 2 months 12 days | 4 years 6 months
Sovereign | BBB |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 15.0 | $ 15.0
Fair value | 0.1 | 0.1
Maximum future payments | $ 15.0 | $ 15.0
Weighted average expected life | 8 months 12 days | 1 year

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
Name: | pfg_CreditDerivativeSoldNotional
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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5708775-113959 + 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
Name: | us-gaap_CreditDerivativesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsARatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsBBBRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |