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Derivative Financial Instruments - Credit Derivatives Sold (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Credit default swaps |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 170.0 | $ 90.0
Fair value | 2.2 | 0.5
Maximum future payments | $ 170.0 | $ 90.0
Weighted average expected life | 4 years 3 months 18 days | 2 years 4 months 24 days
Single name credit default swaps | Corporate debt securities | A |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 20.0 | $ 5.0
Fair value | 0.4 |
Maximum future payments | $ 20.0 | $ 5.0
Weighted average expected life | 5 years | 6 months
Single name credit default swaps | Corporate debt securities | BBB |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 115.0 | $ 70.0
Fair value | 1.4 | 0.2
Maximum future payments | $ 115.0 | $ 70.0
Weighted average expected life | 4 years 4 months 24 days | 2 years 7 months 6 days
Single name credit default swaps | Sovereign | A |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 20.0 |
Fair value | 0.3 |
Maximum future payments | $ 20.0 |
Weighted average expected life | 5 years |
Single name credit default swaps | Sovereign | BBB |  |
Credit derivatives sold disclosures |  |
Notional amount | $ 15.0 | $ 15.0
Fair value | 0.1 | 0.3
Maximum future payments | $ 15.0 | $ 15.0
Weighted average expected life | 1 year 6 months | 2 years

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- 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

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- 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

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- 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=109980867&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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- Details
Name: | us-gaap_CreditDerivativesByContractTypeAxis=pfg_SingleNameCreditDefaultSwapsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsARatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Namespace Prefix: |
Data Type: | na
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