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Derivative Financial Instruments - Fair Value Hedges (Details) - Fixed maturities, available-for-sale - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Fair Value Hedges |  |
Amortized cost of hedged item - Active hedging relationships | $ 152.8 | $ 142.0
Amortized cost of hedged item - Discontinued hedging relationships | 141.5 | 159.3
Amortized cost of hedged item - Active or discontinued hedging relationships | 294.3 | 301.3
Cumulative amount of fair value hedging basis adjustment - Active hedging relationships | 29.1 | 18.1
Cumulative amount of fair value hedging basis adjustment - Discontinued hedging relationships | 7.1 | 7.7
Cumulative amount of fair value hedging basis adjustment - Active or discontinued hedging relationships | $ 36.2 | $ 25.8

X
- Definition Amount of asset previously hedged in a fair value hedging relationship that has been discontinued. + References No definition available. + Details
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Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of asset hedged in fair value hedging relationship or previously hedged in a fair value hedging relationship that has been discontinued. + References No definition available. + Details
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Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, including amount remaining after discontinued hedge. + References No definition available. + Details
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Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, remaining after discontinued hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

X
- Definition Amount of asset hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959 + Details
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Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
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Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |