XML 37 R25.htm IDEA: XBRL DOCUMENT
v3.21.1

Investments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2021
Investments |
Available-for-Sale Securities (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | Allowance | ​ | ​ | ​
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | for credit | ​ | ​ | ​
​ |  | cost (1) |  | gains |  | losses |  | loss |  | Fair value
​ | ​ | (in millions)
March 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fixed maturities, available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and agencies | ​ | $ | 1,836.7 | ​ | $ | 110.1 | ​ | $ | 60.0 | ​ | $ | — | ​ | $ | 1,886.8
Non-U.S. governments | ​ | ​ | 921.2 | ​ | ​ | 133.4 | ​ | ​ | 0.9 | ​ | ​ | — | ​ | ​ | 1,053.7
States and political subdivisions | ​ | ​ | 8,269.1 | ​ | ​ | 747.2 | ​ | ​ | 79.2 | ​ | ​ | — | ​ | ​ | 8,937.1
Corporate | ​ | ​ | 41,493.6 | ​ | ​ | 4,017.8 | ​ | ​ | 321.2 | ​ | ​ | 0.9 | ​ | ​ | 45,189.3
Residential mortgage-backed pass-through securities | ​ | ​ | 2,724.4 | ​ | ​ | 92.0 | ​ | ​ | 18.6 | ​ | ​ | — | ​ | ​ | 2,797.8
Commercial mortgage-backed securities | ​ | ​ | 4,826.8 | ​ | ​ | 171.4 | ​ | ​ | 50.3 | ​ | ​ | 7.0 | ​ | ​ | 4,940.9
Collateralized debt obligations (2) | ​ | ​ | 4,156.4 | ​ | ​ | 9.5 | ​ | ​ | 13.0 | ​ | ​ | 2.6 | ​ | ​ | 4,150.3
Other debt obligations | ​ | ​ | 6,634.1 | ​ | ​ | 173.4 | ​ | ​ | 22.5 | ​ | ​ | — | ​ | ​ | 6,785.0
Total fixed maturities, available-for-sale | ​ | $ | 70,862.3 | ​ | $ | 5,454.8 | ​ | $ | 565.7 | ​ | $ | 10.5 | ​ | $ | 75,740.9
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | Allowance | ​ | ​
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | for credit | ​ | ​
​ | ​ | cost (1) | ​ | gains | ​ | losses | ​ | loss | ​ | Fair value
​ | ​ | ​ | (in millions)
December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fixed maturities, available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and agencies | ​ | $ | 1,893.1 | ​ | $ | 228.9 | ​ | $ | 10.5 | ​ | $ | — | ​ | $ | 2,111.5
Non-U.S. governments | ​ | ​ | 881.6 | ​ | ​ | 192.1 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,073.7
States and political subdivisions | ​ | ​ | 8,004.9 | ​ | ​ | 1,175.5 | ​ | ​ | 12.6 | ​ | ​ | — | ​ | ​ | 9,167.8
Corporate | ​ | ​ | 41,289.9 | ​ | ​ | 6,160.9 | ​ | ​ | 95.1 | ​ | ​ | 0.9 | ​ | ​ | 47,354.8
Residential mortgage-backed pass-through securities | ​ | ​ | 2,857.6 | ​ | ​ | 129.4 | ​ | ​ | 0.2 | ​ | ​ | — | ​ | ​ | 2,986.8
Commercial mortgage-backed securities | ​ | ​ | 4,741.2 | ​ | ​ | 241.3 | ​ | ​ | 35.9 | ​ | ​ | 4.3 | ​ | ​ | 4,942.3
Collateralized debt obligations (2) | ​ | ​ | 4,045.9 | ​ | ​ | 8.7 | ​ | ​ | 24.9 | ​ | ​ | 2.2 | ​ | ​ | 4,027.5
Other debt obligations | ​ | ​ | 6,832.6 | ​ | ​ | 243.2 | ​ | ​ | 29.9 | ​ | ​ | — | ​ | ​ | 7,045.9
Total fixed maturities, available-for-sale | ​ | $ | 70,546.8 | ​ | $ | 8,380.0 | ​ | $ | 209.1 | ​ | $ | 7.4 | ​ | $ | 78,710.3
(1) | Amortized cost excludes accrued interest receivable of $576.3 million and $552.5 million as of March 31, 2021 and December 31, 2020, respectively.
(2) | Primarily consists of collateralized loan obligations backed by secured corporate loans.
Fixed Maturities Available-for-Sale by Contractual Maturity (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized cost |  | Fair value
​ | ​ | (in millions)
Due in one year or less | ​ | $ | 2,317.8 | ​ | $ | 2,358.1
Due after one year through five years | ​ |  | 10,501.4 | ​ |  | 11,112.0
Due after five years through ten years | ​ |  | 14,525.5 | ​ |  | 15,533.1
Due after ten years | ​ |  | 25,175.9 | ​ |  | 28,063.7
Subtotal | ​ |  | 52,520.6 | ​ |  | 57,066.9
Mortgage-backed and other asset-backed securities | ​ |  | 18,341.7 | ​ |  | 18,674.0
Total | ​ | $ | 70,862.3 | ​ | $ | 75,740.9
​
Net Realized Capital Gains and Losses (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended
​ | ​ | March 31,
​ |  | 2021 |  | 2020
​ | ​ | (in millions)
Fixed maturities, available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​
Gross gains | ​ | $ | 37.0 | ​ | $ | 23.1
Gross losses | ​ |  | (5.1) | ​ |  | (4.2)
Net credit losses | ​ |  | (4.4) | ​ |  | (7.9)
Hedging, net (1) | ​ |  | — | ​ |  | (1.5)
Fixed maturities, trading (2) | ​ |  | (14.1) | ​ |  | (16.4)
Equity securities (3) | ​ |  | 16.2 | ​ |  | (63.7)
Mortgage loans | ​ |  | 4.7 | ​ |  | (15.7)
Derivatives (1) | ​ |  | 113.6 | ​ |  | 290.5
Other | ​ |  | 3.5 | ​ |  | (72.8)
Net realized capital gains | ​ | $ | 151.4 | ​ | $ | 131.4
(1) | The change in fair value of fixed maturities, available-for-sale and the change in fair value of derivative hedging instruments in fair value hedging relationships are reported in net investment income with the earnings effect of fixed maturities, available-for-sale.
(2) | Unrealized gains (losses) on fixed maturities, trading still held at the reporting date were $(14.0) million and $(14.2) million for the three months ended March 31, 2021 and 2020, respectively.
(3) | Unrealized gains (losses) on equity securities still held at the reporting date were $7.4 million and $(66.0) million for the three months ended March 31, 2021 and 2020, respectively. This excludes $5.2 million and $(38.5) million of unrealized gains (losses) on equity securities still held at the reporting date for the three months ended March 31, 2021 and 2020, respectively, that were reported in net investment income.
Allowance for credit loss (Tables) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended March 31, 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Residential | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | mortgage- | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | backed | ​ | Commercial | ​ | Collateralized | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | U.S. | ​ | ​ | ​ | ​ | States and | ​ | ​ | ​ | ​ | pass- | ​ | mortgage- | ​ | debt | ​ | Other | ​ | ​ | ​
​ | ​ | government | ​ | Non-U.S | ​ | political | ​ | ​ | ​ | ​ | through | ​ | backed | ​ | obligations | ​ | debt | ​ | ​ | ​
​ |  | and agencies |  | governments |  | subdivisions |  | Corporate |  | securities |  | securities |  | (1) |  | obligations |  | Total
​ | ​ | (in millions)
Beginning balance | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 0.9 | ​ | $ | — | ​ | $ | 4.3 | ​ | $ | 2.2 | ​ | $ | — | ​ | $ | 7.4
Additions for credit losses not previously recorded |  | ​ | — |  | ​ | — |  | ​ | — |  | ​ | — | ​ | ​ | — |  | ​ | 0.3 |  | ​ | — |  | ​ | — |  | ​ | 0.3
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2.4 | ​ | ​ | 0.4 | ​ | ​ | — | ​ | ​ | 2.8
Ending balance |  | $ | — |  | $ | — |  | $ | — |  | $ | 0.9 | ​ | $ | — |  | $ | 7.0 |  | $ | 2.6 |  | $ | — |  | $ | 10.5
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended March 31, 2020
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Residential | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | mortgage- | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | backed | ​ | Commercial | ​ | Collateralized | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | U.S. | ​ | ​ | ​ | ​ | States and | ​ | ​ | ​ | ​ | pass- | ​ | mortgage- | ​ | debt | ​ | Other | ​ | ​ | ​
​ | ​ | government | ​ | Non-U.S | ​ | political | ​ | ​ | ​ | ​ | through | ​ | backed | ​ | obligations | ​ | debt | ​ | ​ | ​
​ |  | and agencies |  | governments |  | subdivisions |  | Corporate |  | securities |  | securities |  | (1) |  | obligations |  | Total
​ | ​ | ​ | (in millions)
Beginning balance (2) |  | $ | — |  | $ | — |  | $ | — |  | $ | — | ​ | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | —
Additions for credit losses not previously recorded |  | ​ | — |  | ​ | — |  | ​ | — |  | ​ | 7.0 | ​ | ​ | — |  | ​ | 0.4 |  | ​ | 0.1 |  | ​ | 0.1 |  | ​ | 7.6
Ending balance |  | $ | — |  | $ | — |  | $ | — |  | $ | 7.0 | ​ | $ | — |  | $ | 0.4 |  | $ | 0.1 |  | $ | 0.1 |  | $ | 7.6
(1) | Primarily consists of collateralized loan obligations backed by secured corporate loans.
(2) | The allowance for credit loss associated with fixed maturities, available-for-sale was applied prospectively upon adoption of authoritative guidance effective January 1, 2020.
Available-for-Sale Securities in Unrealized Loss Positions Without an Allowance for Credit Loss (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021
​ | ​ | Less than | ​ | Greater than or | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | twelve months | ​ | equal to twelve months | ​ | Total
​ |  | ​ |  | Gross |  | ​ |  | Gross |  | ​ |  | Gross
​ | ​ | Fair | ​ | unrealized | ​ | Fair | ​ | unrealized | ​ | Fair | ​ | unrealized
​ | ​ | value | ​ | losses | ​ | value | ​ | losses | ​ | value | ​ | losses
​ | ​ | (in millions)
Fixed maturities, available-for-sale (1): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and agencies | ​ | $ | 528.1 | ​ | $ | 60.0 | ​ | $ | — | ​ | $ | — | ​ | $ | 528.1 | ​ | $ | 60.0
Non-U.S. governments | ​ | ​ | 33.7 | ​ | ​ | 0.9 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 33.7 | ​ | ​ | 0.9
States and political subdivisions | ​ | ​ | 1,648.1 | ​ | ​ | 72.0 | ​ | ​ | 56.6 | ​ | ​ | 7.3 | ​ | ​ | 1,704.7 | ​ | ​ | 79.3
Corporate | ​ | ​ | 5,874.6 | ​ | ​ | 264.0 | ​ | ​ | 606.7 | ​ | ​ | 56.8 | ​ | ​ | 6,481.3 | ​ | ​ | 320.8
Residential mortgage-backed pass-through securities | ​ | ​ | 874.6 | ​ | ​ | 18.6 | ​ | ​ | 1.3 | ​ | ​ | — | ​ | ​ | 875.9 | ​ | ​ | 18.6
Commercial mortgage-backed securities | ​ | ​ | 898.2 | ​ | ​ | 18.6 | ​ | ​ | 628.1 | ​ | ​ | 30.4 | ​ | ​ | 1,526.3 | ​ | ​ | 49.0
Collateralized debt obligations (2) | ​ | ​ | 820.0 | ​ | ​ | 2.4 | ​ | ​ | 1,060.6 | ​ | ​ | 9.9 | ​ | ​ | 1,880.6 | ​ | ​ | 12.3
Other debt obligations | ​ | ​ | 1,446.2 | ​ | ​ | 15.9 | ​ | ​ | 193.0 | ​ | ​ | 6.5 | ​ | ​ | 1,639.2 | ​ | ​ | 22.4
Total fixed maturities, available-for-sale | ​ | $ | 12,123.5 | ​ | $ | 452.4 | ​ | $ | 2,546.3 | ​ | $ | 110.9 | ​ | $ | 14,669.8 | ​ | $ | 563.3
(1) | Fair value and gross unrealized losses are excluded for available-for-sale securities for which an allowance for credit loss has been recorded.
(2) | Primarily consists of collateralized loan obligations backed by secured corporate loans.
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | Less than | ​ | Greater than or | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | twelve months | ​ | equal to twelve months | ​ | Total
​ |  | ​ |  | Gross |  | ​ | ​ |  | Gross |  | ​ |  | Gross
​ | ​ | Fair | ​ | unrealized | ​ | Fair | ​ | unrealized | ​ | Fair | ​ | unrealized
​ | ​ | value | ​ | losses | ​ | value | ​ | losses | ​ | value | ​ | losses
​ | ​ | (in millions)
Fixed maturities, available-for-sale (1): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and agencies | ​ | $ | 351.1 | ​ | $ | 10.4 | ​ | $ | — | ​ | $ | — | ​ | $ | 351.1 | ​ | $ | 10.4
States and political subdivisions | ​ |  | 363.5 | ​ |  | 12.5 | ​ |  | — | ​ |  | — | ​ |  | 363.5 | ​ |  | 12.5
Corporate | ​ |  | 1,578.7 | ​ |  | 54.4 | ​ |  | 267.9 | ​ |  | 40.6 | ​ |  | 1,846.6 | ​ |  | 95.0
Residential mortgage-backed pass-through securities | ​ |  | 92.3 | ​ |  | 0.2 | ​ |  | 1.6 | ​ |  | — | ​ |  | 93.9 | ​ |  | 0.2
Commercial mortgage-backed securities | ​ |  | 970.9 | ​ |  | 22.1 | ​ |  | 137.4 | ​ |  | 12.2 | ​ |  | 1,108.3 | ​ |  | 34.3
Collateralized debt obligations (2) | ​ |  | 1,750.6 | ​ |  | 11.1 | ​ |  | 931.1 | ​ |  | 12.9 | ​ |  | 2,681.7 | ​ |  | 24.0
Other debt obligations | ​ |  | 802.3 | ​ |  | 28.1 | ​ |  | 61.1 | ​ |  | 1.7 | ​ |  | 863.4 | ​ |  | 29.8
Total fixed maturities, available-for-sale | ​ | $ | 5,909.4 | ​ | $ | 138.8 | ​ | $ | 1,399.1 | ​ | $ | 67.4 | ​ | $ | 7,308.5 | ​ | $ | 206.2
(1) | Fair value and gross unrealized losses are excluded for available-for-sale securities for which an allowance for credit loss has been recorded.
(2) | Primarily consists of collateralized loan obligations backed by secured corporate loans.
Net Unrealized Gains and Losses on Available-for-Sale Securities and Derivative Instruments (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2021 |  | December 31, 2020
​ | ​ | (in millions)
Net unrealized gains on fixed maturities, available-for-sale (1) | ​ | $ | 4,897.8 | ​ | $ | 8,193.0
Net unrealized gains on derivative instruments | ​ |  | 35.2 | ​ |  | 38.9
Adjustments for assumed changes in amortization patterns | ​ |  | (292.7) | ​ |  | (437.3)
Adjustments for assumed changes in policyholder liabilities | ​ |  | (1,187.6) | ​ |  | (2,603.9)
Net unrealized gains on other investments and noncontrolling interest adjustments | ​ |  | 69.1 | ​ |  | 78.0
Provision for deferred income taxes | ​ |  | (740.9) | ​ |  | (1,112.2)
Net unrealized gains on available-for-sale securities and derivative instruments | ​ | $ | 2,780.9 | ​ | $ | 4,156.5
(1) | Excludes net unrealized gains (losses) on fixed maturities, available-for-sale included in fair value hedging relationships.
Financing Receivable Credit Quality Indicators (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of March 31, 2021
​ |  | 2021 |  | 2020 |  | 2019 |  | 2018 |  | 2017 |  | Prior |  | Total
​ | ​ | ​ | (in millions)
Commercial mortgage loans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
A- and above |  | $ | 621.3 |  | $ | 1,751.8 |  | $ | 2,481.3 |  | $ | 2,486.1 |  | $ | 1,729.8 |  | $ | 4,966.1 |  | $ | 14,036.4
BBB+ thru BBB- |  | ​ | 45.4 |  | ​ | 197.8 |  | ​ | 193.3 |  | ​ | 301.9 |  | ​ | 262.8 |  | ​ | 561.6 |  | ​ | 1,562.8
BB+ thru BB- |  | ​ | — |  | ​ | 29.2 |  | ​ | 80.4 |  | ​ | — |  | ​ | — |  | ​ | 52.4 |  | ​ | 162.0
B+ and below |  | ​ | — |  | ​ | 13.0 |  | ​ | 20.1 |  | ​ | — |  | ​ | 5.7 |  | ​ | 41.9 |  | ​ | 80.7
Total |  | $ | 666.7 |  | $ | 1,991.8 |  | $ | 2,775.1 |  | $ | 2,788.0 |  | $ | 1,998.3 |  | $ | 5,622.0 |  | $ | 15,841.9
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Direct financing leases: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
A- and above |  | $ | — |  | $ | 43.9 |  | $ | 1.6 |  | $ | 42.7 |  | $ | 19.3 |  | $ | 217.3 |  | $ | 324.8
BBB+ thru BBB- |  | ​ | 30.8 |  | ​ | 88.1 |  | ​ | 5.5 |  | ​ | 11.4 |  | ​ | 18.3 |  | ​ | 38.8 |  | ​ | 192.9
BB+ thru BB- |  | ​ | — |  | ​ | 13.3 |  | ​ | — |  | ​ | — |  | ​ | — |  | ​ | 1.8 |  | ​ | 15.1
B+ and below |  | ​ | — |  | ​ | 42.5 |  | ​ | 22.5 |  | ​ | 12.0 |  | ​ | — |  | ​ | 109.2 |  | ​ | 186.2
Total |  | $ | 30.8 |  | $ | 187.8 |  | $ | 29.6 |  | $ | 66.1 |  | $ | 37.6 |  | $ | 367.1 |  | $ | 719.0
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage loans: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Performing |  | $ | 423.0 |  | $ | 713.0 |  | $ | 277.5 |  | $ | 147.7 |  | $ | 170.6 |  | $ | 641.4 |  | $ | 2,373.2
Non-performing |  | ​ | — |  | ​ | 0.6 |  | ​ | — |  | ​ | — |  | ​ | — |  | ​ | 8.5 |  | ​ | 9.1
Total |  | $ | 423.0 |  | $ | 713.6 |  | $ | 277.5 |  | $ | 147.7 |  | $ | 170.6 |  | $ | 649.9 |  | $ | 2,382.3
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reinsurance recoverables |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | $ | 1,089.7
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of December 31, 2020
​ |  | 2020 | ​ | 2019 | ​ | 2018 | ​ | 2017 | ​ | 2016 | ​ | Prior | ​ | Total
​ | ​ | (in millions)
Commercial mortgage loans: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
A- and above | ​ | $ | 1,807.6 | ​ | $ | 2,486.8 | ​ | $ | 2,464.7 | ​ | $ | 1,780.8 | ​ | $ | 1,417.8 | ​ | $ | 3,697.0 | ​ | $ | 13,654.7
BBB+ thru BBB- | ​ |  | 149.1 | ​ |  | 194.1 | ​ |  | 352.5 | ​ |  | 262.7 | ​ |  | 75.8 | ​ |  | 499.7 | ​ |  | 1,533.9
BB+ thru BB- | ​ |  | 23.7 | ​ |  | 69.0 | ​ |  | — | ​ |  | — | ​ |  | 9.1 | ​ |  | 43.9 | ​ |  | 145.7
B+ and below | ​ |  | 39.4 | ​ |  | 20.0 | ​ |  | — | ​ |  | 5.8 | ​ |  | 6.6 | ​ |  | 35.5 | ​ |  | 107.3
Total | ​ | $ | 2,019.8 | ​ | $ | 2,769.9 | ​ | $ | 2,817.2 | ​ | $ | 2,049.3 | ​ | $ | 1,509.3 | ​ | $ | 4,276.1 | ​ | $ | 15,441.6
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Direct financing leases: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
A- and above | ​ | $ | 43.9 | ​ | $ | 1.6 | ​ | $ | 42.6 | ​ | $ | 19.2 | ​ | $ | 15.3 | ​ | $ | 202.9 | ​ | $ | 325.5
BBB+ thru BBB- | ​ |  | 94.9 | ​ |  | 5.5 | ​ |  | 11.3 | ​ |  | 18.4 | ​ |  | 3.0 | ​ |  | 35.5 | ​ |  | 168.6
BB+ thru BB- | ​ |  | 13.3 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 1.9 | ​ |  | 15.2
B+ and below | ​ |  | 57.6 | ​ |  | 22.5 | ​ |  | 11.9 | ​ |  | — | ​ |  | 1.0 | ​ |  | 108.5 | ​ |  | 201.5
Total | ​ | $ | 209.7 | ​ | $ | 29.6 | ​ | $ | 65.8 | ​ | $ | 37.6 | ​ | $ | 19.3 | ​ | $ | 348.8 | ​ | $ | 710.8
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage loans: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Performing | ​ | $ | 699.1 | ​ | $ | 336.7 | ​ | $ | 167.0 | ​ | $ | 165.1 | ​ | $ | 167.6 | ​ | $ | 398.7 | ​ | $ | 1,934.2
Non-performing | ​ |  | — | ​ |  | 2.0 | ​ |  | 0.8 | ​ |  | 1.4 | ​ |  | 0.4 | ​ |  | 12.7 | ​ |  | 17.3
Total | ​ | $ | 699.1 | ​ | $ | 338.7 | ​ | $ | 167.8 | ​ | $ | 166.5 | ​ | $ | 168.0 | ​ | $ | 411.4 | ​ | $ | 1,951.5
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reinsurance recoverables | ​ | ​ | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ | $ | 1,098.0
​
Non-Accrual Financing Receivables (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | March 31, 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | Amortized cost
​ | ​ | Beginning | ​ | Ending | ​ | of nonaccrual
​ | ​ | amortized cost | ​ | amortized cost | ​ | assets without
​ | ​ | on nonaccrual | ​ | on nonaccrual | ​ | a valuation
​ |  | status |  | status |  | allowance
​ | ​ | ​ | (in millions)
Commercial mortgage loans | ​ | $ | 10.7 | ​ | $ | 5.2 | ​ | $ | —
Residential mortgage loans | ​ | ​ | 10.8 | ​ | ​ | 5.7 | ​ | ​ | 0.7
Total | ​ | $ | 21.5 | ​ | $ | 10.9 | ​ | $ | 0.7
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | ​ | ​ | ​ | ​ | ​ | Amortized cost
​ | ​ | Beginning | ​ | Ending | ​ | of nonaccrual
​ | ​ | amortized cost | ​ | amortized cost | ​ | assets without
​ | ​ | on nonaccrual | ​ | on nonaccrual | ​ | a valuation
​ |  | status |  | status |  | allowance
​ | ​ | ​ | (in millions)
Commercial mortgage loans | ​ | $ | 5.0 | ​ | $ | 10.7 | ​ | $ | —
Residential mortgage loans |  | ​ | 6.8 |  | ​ | 10.8 |  | ​ | 0.7
Total |  | $ | 11.8 |  | $ | 21.5 |  | $ | 0.7
Financing Receivables Aging (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Amortized
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | cost
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 90 days or | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 90 days or
​ | ​ | 30-59 days | ​ | 60-89 days | ​ | more past | ​ | Total past | ​ | ​ | ​ | ​ | ​ | ​ | ​ | more and
​ | ​ | past due | ​ | past due | ​ | due | ​ | due | ​ | Current | ​ | Total (1) | ​ | accruing
​ | ​ | (in millions)
Commercial mortgage loans | ​ | $ | 8.2 | ​ | $ | 0.8 | ​ | $ | 8.2 | ​ | $ | 17.2 | ​ | $ | 15,824.7 | ​ | $ | 15,841.9 | ​ | $ | 3.0
Direct financing leases | ​ | ​ | 62.8 | ​ | ​ | 1.0 | ​ | ​ | 3.2 | ​ | ​ | 67.0 | ​ | ​ | 652.0 | ​ | ​ | 719.0 | ​ | ​ | 3.2
Residential mortgage loans | ​ | ​ | 46.0 | ​ | ​ | 5.9 | ​ | ​ | 6.9 | ​ | ​ | 58.8 | ​ | ​ | 2,323.5 | ​ | ​ | 2,382.3 | ​ | ​ | 3.4
Total | ​ | $ | 117.0 | ​ | $ | 7.7 | ​ | $ | 18.3 | ​ | $ | 143.0 | ​ | $ | 18,800.2 | ​ | $ | 18,943.2 | ​ | $ | 9.6
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Amortized
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | cost
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 90 days or | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 90 days or
​ | ​ | 30-59 days | ​ | 60-89 days | ​ | more past | ​ | Total past | ​ | ​ | ​ | ​ | ​ | ​ | ​ | more and
​ | ​ | past due | ​ | past due | ​ | due | ​ | due | ​ | Current | ​ | Total (1) | ​ | accruing
​ | ​ | (in millions)
Commercial mortgage loans | ​ | $ | 42.1 | ​ | $ | 9.2 | ​ | $ | 12.0 | ​ | $ | 63.3 | ​ | $ | 15,378.3 | ​ | $ | 15,441.6 | ​ | $ | 1.3
Direct financing leases | ​ |  | — | ​ |  | 3.2 | ​ |  | — | ​ |  | 3.2 | ​ |  | 707.6 | ​ |  | 710.8 | ​ |  | —
Residential mortgage loans | ​ |  | 66.6 | ​ |  | 8.8 | ​ |  | 10.9 | ​ |  | 86.3 | ​ |  | 1,865.2 | ​ |  | 1,951.5 | ​ |  | 6.5
Total | ​ | $ | 108.7 | ​ | $ | 21.2 | ​ | $ | 22.9 | ​ | $ | 152.8 | ​ | $ | 17,951.1 | ​ | $ | 18,103.9 | ​ | $ | 7.8
(1) | As of both March 31, 2021 and December 31, 2020, no reinsurance recoverables were considered past due.
Financing Receivables Valuation Allowance (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended March 31, 2021
​ | ​ | ​ | ​ | ​ | Direct | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Commercial | ​ | financing | ​ | Residential | ​ | Reinsurance | ​ | ​ | ​
​ |  | mortgage loans |  | leases |  | mortgage loans |  | recoverables |  | Total
​ | ​ | ​ | (in millions)
Beginning balance | ​ | $ | 43.2 | ​ | $ | 0.1 | ​ | $ | 6.9 | ​ | $ | 2.7 | ​ | $ | 52.9
Provision |  | ​ | (0.1) |  | ​ | — |  | ​ | (3.9) |  | ​ | — |  | ​ | (4.0)
Charge-offs |  | ​ | — |  | ​ | — |  | ​ | (0.1) |  | ​ | — |  | ​ | (0.1)
Recoveries |  | ​ | — |  | ​ | — |  | ​ | 1.0 |  | ​ | — |  | ​ | 1.0
Ending balance |  | $ | 43.1 |  | $ | 0.1 |  | $ | 3.9 |  | $ | 2.7 |  | $ | 49.8
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended March 31, 2020
​ | ​ | ​ | ​ | ​ | Direct | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Commercial | ​ | financing | ​ | Residential | ​ | Reinsurance | ​ | ​ | ​
​ | ​ | mortgage loans |  | leases |  | mortgage loans |  | recoverables |  | Total
​ |  | ​ | (in millions)
Beginning balance (1) | ​ | $ | 27.3 | ​ | $ | — | ​ | $ | 3.3 | ​ | $ | 2.5 | ​ | $ | 33.1
Provision (2) |  | ​ | 10.4 |  | ​ | 0.2 |  | ​ | 2.3 |  | ​ | — |  | ​ | 12.9
Charge-offs |  | ​ | — |  | ​ | — |  | ​ | (0.1) |  | ​ | — |  | ​ | (0.1)
Recoveries |  | ​ | — |  | ​ | — |  | ​ | 0.6 |  | ​ | — |  | ​ | 0.6
Ending balance |  | $ | 37.7 |  | $ | 0.2 |  | $ | 6.1 |  | $ | 2.5 |  | $ | 46.5
(1) | Upon adoption of authoritative guidance effective January 1, 2020, we updated accounting policies and methodology, adjusted the commercial and residential mortgage loan valuation allowance and established a valuation allowance for reinsurance recoverables. See Note 1, Nature of Operations and Significant Accounting Policies under the caption, “Recent Accounting Pronouncements” for further details.
(2) | During the three months ended March 31, 2020, COVID-19 adversely impacted global economic activity and contributed to significant volatility in financial markets. As a result, certain current and forecasted environmental factors management believed to be relevant were adjusted, resulting in an increase in the valuation allowance for commercial and residential mortgage loans and direct financing leases.
​
Mortgage Loans Purchased and Sold (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended
​ | ​ | March 31,
​ |  | 2021 |  | 2020
​ | ​ | (in millions)
Commercial mortgage loans: |  | ​ |  |  | ​ |
Purchased | ​ | $ | 89.2 | ​ | $ | 12.8
Sold | ​ | ​ | 66.3 | ​ | ​ | 1.1
Residential mortgage loans: | ​ |  | ​ | ​ |  | ​
Purchased (1) | ​ |  | 651.0 | ​ |  | 226.8
Sold | ​ |  | 37.0 | ​ |  | 24.9
(1) | Includes mortgage loans purchased by a residential mortgage loan VIE established in 2021.
Commercial Mortgage Loans by Geographic Distribution and Property Type Distribution (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021 | ​ | December 31, 2020 |
​ |  | Amortized |  | Percent |  | Amortized |  | Percent |
​ | ​ | cost | ​ | of total | ​ | cost | ​ | of total |
​ | ​ | ($ in millions) |
Geographic distribution | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
New England | ​ | $ | 590.9 | ​ | 3.7 | % | $ | 593.9 | ​ | 3.8 | %
Middle Atlantic | ​ |  | 4,515.1 | ​ | 28.5 | ​ |  | 4,438.2 | ​ | 28.8 | ​
East North Central | ​ |  | 565.1 | ​ | 3.6 | ​ |  | 572.6 | ​ | 3.7 | ​
West North Central | ​ |  | 276.1 | ​ | 1.7 | ​ |  | 267.5 | ​ | 1.7 | ​
South Atlantic | ​ |  | 2,374.0 | ​ | 15.0 | ​ |  | 2,368.9 | ​ | 15.3 | ​
East South Central | ​ |  | 323.7 | ​ | 2.0 | ​ |  | 316.6 | ​ | 2.1 | ​
West South Central | ​ |  | 1,392.8 | ​ | 8.8 | ​ |  | 1,315.9 | ​ | 8.5 | ​
Mountain | ​ |  | 949.5 | ​ | 6.0 | ​ |  | 936.2 | ​ | 6.1 | ​
Pacific | ​ |  | 4,384.5 | ​ | 27.7 | ​ |  | 4,183.0 | ​ | 27.1 | ​
International | ​ |  | 470.2 | ​ | 3.0 | ​ |  | 448.8 | ​ | 2.9 | ​
Total | ​ | $ | 15,841.9 | ​ | 100.0 | % | $ | 15,441.6 | ​ | 100.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Property type distribution | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Office | ​ | $ | 4,538.4 | ​ | 28.5 | % | $ | 4,491.7 | ​ | 29.0 | %
Retail | ​ |  | 1,784.5 | ​ | 11.3 | ​ |  | 1,815.3 | ​ | 11.8 | ​
Industrial | ​ |  | 2,782.4 | ​ | 17.6 | ​ |  | 2,488.7 | ​ | 16.1 | ​
Apartments | ​ |  | 6,020.6 | ​ | 38.0 | ​ |  | 5,958.0 | ​ | 38.6 | ​
Hotel | ​ |  | 88.6 | ​ | 0.6 | ​ |  | 89.4 | ​ | 0.6 | ​
Mixed use/other | ​ |  | 627.4 | ​ | 4.0 | ​ |  | 598.5 | ​ | 3.9 | ​
Total | ​ | $ | 15,841.9 | ​ | 100.0 | % | $ | 15,441.6 | ​ | 100.0 | %
Financial Assets Subject to Netting Agreements (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross amounts not offset in the | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | consolidated statements | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | of financial position | ​ | ​ | ​
​ | ​ | Gross amount | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | of recognized | ​ | Financial | ​ | Collateral | ​ | ​ | ​
​ |  | assets (1) |  | instruments (2) |  | received |  | Net amount
​ | ​ | (in millions)
March 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative assets | ​ | $ | 337.8 | ​ | $ | (101.3) | ​ | $ | (226.3) | ​ | $ | 10.2
Reverse repurchase agreements | ​ | ​ | 65.6 | ​ | ​ | — | ​ | ​ | (65.6) | ​ | ​ | —
Total | ​ | $ | 403.4 | ​ | $ | (101.3) | ​ | $ | (291.9) | ​ | $ | 10.2
December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative assets | ​ | $ | 463.5 | ​ | $ | (132.5) | ​ | $ | (293.5) | ​ | $ | 37.5
Reverse repurchase agreements | ​ |  | 63.7 | ​ | ​ | — | ​ | ​ | (63.7) | ​ | ​ | —
Total | ​ | $ | 527.2 | ​ | $ | (132.5) | ​ | $ | (357.2) | ​ | $ | 37.5
(1) | The gross amount of recognized derivative and reverse repurchase agreement assets are reported with other investments and cash and cash equivalents, respectively, on the consolidated statements of financial position. The above excludes $0.0 million and $0.0 million of derivative assets as of March 31, 2021 and December 31, 2020, respectively, that are not subject to master netting agreements or similar agreements. The gross amounts of derivative and reverse repurchase agreement assets are not netted against offsetting liabilities for presentation on the consolidated statements of financial position.
(2) | Represents amount of offsetting derivative liabilities that are subject to an enforceable master netting agreement or similar agreement that are not netted against the gross derivative assets for presentation on the consolidated statements of financial position.
Financial Liabilities Subject to Netting Agreements (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross amounts not offset in the | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | consolidated statements | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | of financial position | ​ | ​ | ​
​ | ​ | Gross amount | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | of recognized | ​ | Financial | ​ | Collateral | ​ | ​ | ​
​ |  | liabilities (1) |  | instruments (2) |  | pledged |  | Net amount
​ | ​ | (in millions)
March 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative liabilities | ​ | $ | 172.2 | ​ | $ | (101.3) | ​ | $ | (62.4) | ​ | $ | 8.5
December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative liabilities | ​ | $ | 186.2 | ​ | $ | (132.5) | ​ | $ | (45.7) | ​ | $ | 8.0
(1) | The gross amount of recognized derivative liabilities is reported with other liabilities on the consolidated statements of financial position. The above excludes $177.9 million and $467.8 million of derivative liabilities as of March 31, 2021 and December 31, 2020, respectively, which are primarily embedded derivatives that are not subject to master netting agreements or similar agreements. The gross amounts of derivative liabilities are not netted against offsetting assets for presentation on the consolidated statements of financial position.
(2) | Represents amount of offsetting derivative assets that are subject to an enforceable master netting agreement or similar agreement that are not netted against the gross derivative liabilities for presentation on the consolidated statements of financial position.

X
- Definition Tabular disclosure of realized and unrealized gain (loss) on investment in security reported in the statement of operations. + References No definition available. + Details
Name: | pfg_GainLossOnInvestmentsStatementOfOperationsTableTextBlock
Namespace Prefix: | pfg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of the various types of trade accounts and notes receivable purchased and sold. + References No definition available. + Details
Name: | pfg_ScheduleOfAccountsNotesLoansAndFinancingReceivablePurchasedAndSoldTableTextBlock
Namespace Prefix: | pfg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of amortized cost and fair value of fixed maturities available-for-sale by contractual maturity. + References No definition available. + Details
Name: | pfg_ScheduleOfAvailableForSaleSecuritiesDebtMaturitiesTableTextBlock
Namespace Prefix: | pfg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure itemizing the commercial mortgage loan portfolio by both geographic distribution and property type distribution. + References No definition available. + Details
Name: | pfg_ScheduleOfCommercialMortgageLoansByGeographicRegionAndSpecificCollateralPropertyTypeTableTextBlock
Namespace Prefix: | pfg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure related to unrealized gains and losses on available-for-sale securities, which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. This disclosure includes information about the cumulative net unrealized gains/losses on fixed maturities available-for-sale, equity securities available-for-sale and derivative instruments net of adjustments related to policy acquisition costs, sales inducements, unearned revenue reserves, changes in policyholder benefits and claims and applicable income taxes. + References No definition available. + Details
Name: | pfg_ScheduleOfNetUnrealizedGainsLossesAvailableForSaleSecuritiesAndDerivativeInstrumentsTableTextBlock
Namespace Prefix: | pfg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
Name: | us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953659-111524 + Details
Name: | us-gaap_FinancingReceivableCreditQualityIndicatorsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of derivative and other financial assets that are subject to offsetting, including master netting arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225877-175312 + Details
Name: | us-gaap_OffsettingAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of derivative and other financial liabilities that are subject to offsetting, including master netting arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225877-175312 + Details
Name: | us-gaap_OffsettingLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of aging analysis for financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919253-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953401-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524 + Details
Name: | us-gaap_PastDueFinancingReceivablesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of financing receivable on nonaccrual status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + Details
Name: | us-gaap_ScheduleOfFinancingReceivablesNonAccrualStatusTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration