Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001104659-15-073334-index-headers.html | 2015-10-28 10:18:30 | |
| 0001104659-15-073334-index.html | 2015-10-28 10:18:30 | |
| 0001104659-15-073334.txt | 2015-10-28 10:18:30 | |
 0001104659-15-073334-xbrl.zip | 628412 | 2015-10-28 10:18:30 |
| a15-17793_110q.htm | 8845278 | 2015-10-28 10:18:30 |
| a15-17793_1ex12.htm | 102547 | 2015-10-28 10:18:30 |
| a15-17793_1ex31d1.htm | 12271 | 2015-10-28 10:18:30 |
| a15-17793_1ex31d2.htm | 12332 | 2015-10-28 10:18:30 |
| a15-17793_1ex31d3.htm | 12317 | 2015-10-28 10:18:30 |
| a15-17793_1ex32d1.htm | 3851 | 2015-10-28 10:18:30 |
| a15-17793_1ex32d2.htm | 3908 | 2015-10-28 10:18:30 |
| a15-17793_1ex32d3.htm | 3974 | 2015-10-28 10:18:30 |
| FilingSummary.xml | 55779 | 2015-10-28 10:18:30 |
| Financial_Report.xlsx | 179647 | 2015-10-28 10:18:30 |
 g177931gei001.gif | 2587 | 2015-10-28 10:18:30 |
| pfg-20150930.xml | 16168376 | 2015-10-28 10:18:30 |
| pfg-20150930.xsd | 136377 | 2015-10-28 10:18:30 |
| pfg-20150930_cal.xml | 169262 | 2015-10-28 10:18:30 |
| pfg-20150930_def.xml | 635951 | 2015-10-28 10:18:30 |
| pfg-20150930_lab.xml | 1196003 | 2015-10-28 10:18:30 |
| pfg-20150930_pre.xml | 965005 | 2015-10-28 10:18:30 |
| R1.htm | 22378 | 2015-10-28 10:18:30 |
| R10.htm | 247469 | 2015-10-28 10:18:30 |
| R11.htm | 1185812 | 2015-10-28 10:18:30 |
| R12.htm | 653608 | 2015-10-28 10:18:30 |
| R13.htm | 29547 | 2015-10-28 10:18:30 |
| R14.htm | 33508 | 2015-10-28 10:18:30 |
| R15.htm | 72457 | 2015-10-28 10:18:30 |
| R16.htm | 16668 | 2015-10-28 10:18:30 |
| R17.htm | 425212 | 2015-10-28 10:18:30 |
| R18.htm | 1510444 | 2015-10-28 10:18:30 |
| R19.htm | 257062 | 2015-10-28 10:18:30 |
| R2.htm | 120890 | 2015-10-28 10:18:30 |
| R20.htm | 31231 | 2015-10-28 10:18:30 |
| R21.htm | 76309 | 2015-10-28 10:18:30 |
| R22.htm | 1749961 | 2015-10-28 10:18:30 |
| R23.htm | 8881 | 2015-10-28 10:18:30 |
| R24.htm | 231523 | 2015-10-28 10:18:30 |
| R25.htm | 1184730 | 2015-10-28 10:18:30 |
| R26.htm | 630151 | 2015-10-28 10:18:30 |
| R27.htm | 33690 | 2015-10-28 10:18:30 |
| R28.htm | 25666 | 2015-10-28 10:18:30 |
| R29.htm | 74746 | 2015-10-28 10:18:30 |
| R3.htm | 70100 | 2015-10-28 10:18:30 |
| R30.htm | 427106 | 2015-10-28 10:18:30 |
| R31.htm | 1458216 | 2015-10-28 10:18:30 |
| R32.htm | 249887 | 2015-10-28 10:18:30 |
| R33.htm | 29167 | 2015-10-28 10:18:30 |
| R34.htm | 74200 | 2015-10-28 10:18:30 |
| R35.htm | 1745491 | 2015-10-28 10:18:30 |
| R36.htm | 13638 | 2015-10-28 10:18:30 |
| R37.htm | 86564 | 2015-10-28 10:18:30 |
| R38.htm | 32573 | 2015-10-28 10:18:30 |
| R39.htm | 48008 | 2015-10-28 10:18:30 |
| R4.htm | 72735 | 2015-10-28 10:18:30 |
| R40.htm | 38456 | 2015-10-28 10:18:30 |
| R41.htm | 40978 | 2015-10-28 10:18:30 |
| R42.htm | 16194 | 2015-10-28 10:18:30 |
| R43.htm | 18166 | 2015-10-28 10:18:30 |
| R44.htm | 85071 | 2015-10-28 10:18:30 |
| R45.htm | 19673 | 2015-10-28 10:18:30 |
| R46.htm | 86716 | 2015-10-28 10:18:30 |
| R47.htm | 48493 | 2015-10-28 10:18:30 |
| R48.htm | 49325 | 2015-10-28 10:18:30 |
| R49.htm | 45808 | 2015-10-28 10:18:30 |
| R5.htm | 31290 | 2015-10-28 10:18:30 |
| R50.htm | 53789 | 2015-10-28 10:18:30 |
| R51.htm | 20789 | 2015-10-28 10:18:30 |
| R52.htm | 9587 | 2015-10-28 10:18:30 |
| R53.htm | 17574 | 2015-10-28 10:18:30 |
| R54.htm | 13029 | 2015-10-28 10:18:30 |
| R55.htm | 49430 | 2015-10-28 10:18:30 |
| R56.htm | 29826 | 2015-10-28 10:18:30 |
| R57.htm | 59024 | 2015-10-28 10:18:30 |
| R58.htm | 27511 | 2015-10-28 10:18:30 |
| R59.htm | 25164 | 2015-10-28 10:18:30 |
| R6.htm | 57122 | 2015-10-28 10:18:30 |
| R60.htm | 44523 | 2015-10-28 10:18:30 |
| R61.htm | 8421 | 2015-10-28 10:18:30 |
| R62.htm | 17682 | 2015-10-28 10:18:30 |
| R63.htm | 46609 | 2015-10-28 10:18:30 |
| R64.htm | 29465 | 2015-10-28 10:18:30 |
| R65.htm | 32573 | 2015-10-28 10:18:30 |
| R66.htm | 10811 | 2015-10-28 10:18:30 |
| R67.htm | 35691 | 2015-10-28 10:18:30 |
| R68.htm | 72104 | 2015-10-28 10:18:30 |
| R69.htm | 56388 | 2015-10-28 10:18:30 |
| R7.htm | 6543 | 2015-10-28 10:18:30 |
| R70.htm | 112918 | 2015-10-28 10:18:30 |
| R71.htm | 151062 | 2015-10-28 10:18:30 |
| R72.htm | 32655 | 2015-10-28 10:18:30 |
| R73.htm | 135993 | 2015-10-28 10:18:30 |
| R74.htm | 28650 | 2015-10-28 10:18:30 |
| R75.htm | 32961 | 2015-10-28 10:18:30 |
| R76.htm | 43091 | 2015-10-28 10:18:30 |
| R77.htm | 15579 | 2015-10-28 10:18:30 |
| R78.htm | 49387 | 2015-10-28 10:18:30 |
| R79.htm | 30899 | 2015-10-28 10:18:30 |
| R8.htm | 122502 | 2015-10-28 10:18:30 |
| R80.htm | 60465 | 2015-10-28 10:18:30 |
| R81.htm | 27196 | 2015-10-28 10:18:30 |
| R82.htm | 25739 | 2015-10-28 10:18:30 |
| R83.htm | 32318 | 2015-10-28 10:18:30 |
| R84.htm | 45014 | 2015-10-28 10:18:30 |
| R85.htm | 183526 | 2015-10-28 10:18:30 |
| R86.htm | 112204 | 2015-10-28 10:18:30 |
| R87.htm | 126901 | 2015-10-28 10:18:30 |
| R88.htm | 175743 | 2015-10-28 10:18:30 |
| R89.htm | 108610 | 2015-10-28 10:18:30 |
| R9.htm | 34686 | 2015-10-28 10:18:30 |
| R90.htm | 118371 | 2015-10-28 10:18:30 |
| report.css | 2767 | 2015-10-28 10:18:30 |
| Show.js | 1410 | 2015-10-28 10:18:30 |