XML 78 R67.htm IDEA: XBRL DOCUMENT
v3.22.1

Fair Value Measurements - Transfers (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Available-for-sale | Fixed maturities |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 | $ 175.2 | $ 130.6
Transfers out of Level 3 into Level 2 | 104.0 |
Available-for-sale | Corporate debt securities |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 | 175.2 | 62.2
Available-for-sale | Collateralized debt obligations |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 |  | 47.8
Transfers out of Level 3 into Level 2 | 84.0 |
Available-for-sale | Other debt obligations |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 |  | $ 20.6
Transfers out of Level 3 into Level 2 | 20.0 |
Trading | Fixed maturities |  |
Fair Value Hierarchy Levels Transfers |  |
Transfers out of Level 2 into Level 3 | $ 29.0 |

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: | pfg_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTransfersLineItems
Namespace Prefix: | pfg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 3. + References No definition available. + Details
Name: | pfg_FairValueAssetsLevel2ToLevel3TransfersAmount
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of transfers of assets measured on a recurring basis out of Level 3 of the fair value hierarchy into Level 2. + References No definition available. + Details
Name: | pfg_FairValueAssetsLevel3ToLevel2TransfersAmount
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentSecondaryCategorizationAxis=us-gaap_AvailableforsaleSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CollateralizedDebtObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentSecondaryCategorizationAxis=pfg_TradingSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |