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Contingencies, Guarantees and Indemnifications - Guarantees and Indemnifications (Details) $ in Millions | Mar. 31, 2020 USD ($)
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Guarantees to third parties primarily related to former subsidiaries and joint ventures |
Guarantees and Indemnifications |
Maximum exposure under guarantees | $ 114.0
Guarantees related to P-Caps contingent funding agreements |
Guarantees and Indemnifications |
Maximum exposure under guarantees | $ 750.0

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees 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 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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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: |
Period Type: |

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- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=pfg_GuaranteesToUnconsolidatedTrustsUnderContingentFundingAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |