XML 88 R76.htm IDEA: XBRL DOCUMENT
v3.20.2

Fair Value Measurements - Transfers (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 3 into Level 2, net derivative assets (liabilities) |  |  | $ 26.5 |
Other investments |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 |  |  |  | $ 10.0
Separate account assets |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 3 into Level 2 |  | $ 172.5 |  | 173.2
Available-for-sale | Fixed maturities |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 | $ 217.3 | 33.7 | 388.1 | 33.7
Transfers out of Level 3 into Level 2 | 289.5 | 2.3 | 525.6 | 28.3
Available-for-sale | Corporate debt securities |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 | 217.3 |  | 342.0 |
Transfers out of Level 3 into Level 2 | 102.6 |  | 148.9 |
Available-for-sale | Commercial mortgage-backed securities |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 |  | 3.7 |  | 3.7
Transfers out of Level 3 into Level 2 |  | 2.3 |  | 2.3
Available-for-sale | Collateralized debt obligations |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 |  | $ 30.0 |  | 30.0
Transfers out of Level 3 into Level 2 | 167.3 |  | 314.6 |
Available-for-sale | Other debt obligations |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 2 into Level 3 |  |  | 46.1 |
Transfers out of Level 3 into Level 2 | 19.6 |  | 62.1 | $ 26.0
Trading | Fixed maturities |  |  |  |
Fair Value Hierarchy Levels Transfers |  |  |  |
Transfers out of Level 3 into Level 2 | $ 0.3 |  | $ 0.3 |

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
- Definition Amount of transfers of net derivative assets (liabilities) measured on a recurring basis out of Level 3 of the fair value hierarchy into Level 2. + References No definition available. + Details
Name: | pfg_FairValueNetDerivativeAssetLiabilityLevel3ToLevel2TransfersAmount
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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

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_FairValueByAssetClassAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
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: |