Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001104659-21-130910-index-headers.html | 2021-10-28 13:50:52 | |
| 0001104659-21-130910-index.html | 2021-10-28 13:50:52 | |
| 0001104659-21-130910.txt | 2021-10-28 13:50:52 | |
 0001104659-21-130910-xbrl.zip | 863063 | 2021-10-28 13:50:52 |
| FilingSummary.xml | 53305 | 2021-10-28 13:50:52 |
| Financial_Report.xlsx | 207707 | 2021-10-28 13:50:52 |
| MetaLinks.json | 1207904 | 2021-10-28 13:50:52 |
| pfg-20211231.xsd | 121536 | 2021-10-28 13:50:52 |
| pfg-20211231x10q.htm | 11981786 | 2021-10-28 13:50:52 |
 pfg-20211231x10q037.jpg | 21235 | 2021-10-28 13:50:52 |
| pfg-20211231x10q_htm.xml | 15732886 | 2021-10-28 13:50:52 |
| pfg-20211231xex10d1.htm | 79357 | 2021-10-28 13:50:52 |
| pfg-20211231xex31d1.htm | 11637 | 2021-10-28 13:50:52 |
| pfg-20211231xex31d2.htm | 11669 | 2021-10-28 13:50:52 |
| pfg-20211231xex32d1.htm | 4244 | 2021-10-28 13:50:52 |
| pfg-20211231xex32d2.htm | 4239 | 2021-10-28 13:50:52 |
| pfg-20211231_cal.xml | 152224 | 2021-10-28 13:50:52 |
| pfg-20211231_def.xml | 522872 | 2021-10-28 13:50:52 |
| pfg-20211231_lab.xml | 1048678 | 2021-10-28 13:50:52 |
| pfg-20211231_pre.xml | 761214 | 2021-10-28 13:50:52 |
| R1.htm | 52180 | 2021-10-28 13:50:52 |
| R10.htm | 1637948 | 2021-10-28 13:50:52 |
| R11.htm | 698510 | 2021-10-28 13:50:52 |
| R12.htm | 43029 | 2021-10-28 13:50:52 |
| R13.htm | 55127 | 2021-10-28 13:50:52 |
| R14.htm | 117367 | 2021-10-28 13:50:52 |
| R15.htm | 12668 | 2021-10-28 13:50:52 |
| R16.htm | 526726 | 2021-10-28 13:50:52 |
| R17.htm | 2056640 | 2021-10-28 13:50:52 |
| R18.htm | 217172 | 2021-10-28 13:50:52 |
| R19.htm | 408120 | 2021-10-28 13:50:52 |
| R2.htm | 131001 | 2021-10-28 13:50:52 |
| R20.htm | 34292 | 2021-10-28 13:50:52 |
| R21.htm | 66539 | 2021-10-28 13:50:52 |
| R22.htm | 91317 | 2021-10-28 13:50:52 |
| R23.htm | 110001 | 2021-10-28 13:50:52 |
| R24.htm | 1621788 | 2021-10-28 13:50:52 |
| R25.htm | 685758 | 2021-10-28 13:50:52 |
| R26.htm | 42672 | 2021-10-28 13:50:52 |
| R27.htm | 52159 | 2021-10-28 13:50:52 |
| R28.htm | 112535 | 2021-10-28 13:50:52 |
| R29.htm | 530465 | 2021-10-28 13:50:52 |
| R3.htm | 42249 | 2021-10-28 13:50:52 |
| R30.htm | 2034346 | 2021-10-28 13:50:52 |
| R31.htm | 195193 | 2021-10-28 13:50:52 |
| R32.htm | 402318 | 2021-10-28 13:50:52 |
| R33.htm | 30093 | 2021-10-28 13:50:52 |
| R34.htm | 65361 | 2021-10-28 13:50:52 |
| R35.htm | 21676 | 2021-10-28 13:50:52 |
| R36.htm | 4587 | 2021-10-28 13:50:52 |
| R37.htm | 40310 | 2021-10-28 13:50:52 |
| R38.htm | 47529 | 2021-10-28 13:50:52 |
| R39.htm | 50786 | 2021-10-28 13:50:52 |
| R4.htm | 79765 | 2021-10-28 13:50:52 |
| R40.htm | 35699 | 2021-10-28 13:50:52 |
| R41.htm | 33813 | 2021-10-28 13:50:52 |
| R42.htm | 36440 | 2021-10-28 13:50:52 |
| R43.htm | 82771 | 2021-10-28 13:50:52 |
| R44.htm | 15915 | 2021-10-28 13:50:52 |
| R45.htm | 82217 | 2021-10-28 13:50:52 |
| R46.htm | 57478 | 2021-10-28 13:50:52 |
| R47.htm | 41072 | 2021-10-28 13:50:52 |
| R48.htm | 66014 | 2021-10-28 13:50:52 |
| R49.htm | 9573 | 2021-10-28 13:50:52 |
| R5.htm | 42383 | 2021-10-28 13:50:52 |
| R50.htm | 15831 | 2021-10-28 13:50:52 |
| R51.htm | 13058 | 2021-10-28 13:50:52 |
| R52.htm | 48279 | 2021-10-28 13:50:52 |
| R53.htm | 30248 | 2021-10-28 13:50:52 |
| R54.htm | 23285 | 2021-10-28 13:50:52 |
| R55.htm | 21412 | 2021-10-28 13:50:52 |
| R56.htm | 16648 | 2021-10-28 13:50:52 |
| R57.htm | 52945 | 2021-10-28 13:50:52 |
| R58.htm | 17743 | 2021-10-28 13:50:52 |
| R59.htm | 31589 | 2021-10-28 13:50:52 |
| R6.htm | 70626 | 2021-10-28 13:50:52 |
| R60.htm | 28241 | 2021-10-28 13:50:52 |
| R61.htm | 50989 | 2021-10-28 13:50:52 |
| R62.htm | 7837 | 2021-10-28 13:50:52 |
| R63.htm | 31062 | 2021-10-28 13:50:52 |
| R64.htm | 7977 | 2021-10-28 13:50:52 |
| R65.htm | 19915 | 2021-10-28 13:50:52 |
| R66.htm | 83599 | 2021-10-28 13:50:52 |
| R67.htm | 76386 | 2021-10-28 13:50:52 |
| R68.htm | 108664 | 2021-10-28 13:50:52 |
| R69.htm | 127373 | 2021-10-28 13:50:52 |
| R7.htm | 74455 | 2021-10-28 13:50:52 |
| R70.htm | 25935 | 2021-10-28 13:50:52 |
| R71.htm | 167416 | 2021-10-28 13:50:52 |
| R72.htm | 8467 | 2021-10-28 13:50:52 |
| R73.htm | 42802 | 2021-10-28 13:50:52 |
| R74.htm | 21671 | 2021-10-28 13:50:52 |
| R75.htm | 61475 | 2021-10-28 13:50:52 |
| R76.htm | 26260 | 2021-10-28 13:50:52 |
| R77.htm | 48597 | 2021-10-28 13:50:52 |
| R78.htm | 92481 | 2021-10-28 13:50:52 |
| R79.htm | 11663 | 2021-10-28 13:50:52 |
| R8.htm | 81505 | 2021-10-28 13:50:52 |
| R80.htm | 18502 | 2021-10-28 13:50:52 |
| R81.htm | 24769 | 2021-10-28 13:50:52 |
| R82.htm | 22843 | 2021-10-28 13:50:52 |
| R83.htm | 10445 | 2021-10-28 13:50:52 |
| R84.htm | 55843 | 2021-10-28 13:50:52 |
| R9.htm | 120738 | 2021-10-28 13:50:52 |
| report.css | 2768 | 2021-10-28 13:50:52 |
| Show.js | 1085 | 2021-10-28 13:50:52 |