XML 108 R92.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Investments - Real Estate (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Real estate |  |  |
Depreciation expense on invested real estate | $ 69.9 | $ 66.1 | $ 67.4
Accumulated depreciation on invested real estate | $ 749.6 | $ 708.5 |

X
- Definition Amount of depreciation expense on real estate for the period. + References No definition available. + Details
Name: | pfg_RealEstateDepreciationExpense
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount as of the balance sheet date of accumulated depreciation pertaining to invested real estate. + References No definition available. + Details
Name: | pfg_RealEstateInvestmentAccumulatedDepreciation
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_RealEstateInvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration