Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000764065-19-000072-index-headers.html | 2019-04-25 10:55:33 | |
| 0000764065-19-000072-index.html | 2019-04-25 10:55:33 | |
| 0000764065-19-000072.txt | 2019-04-25 10:55:33 | |
 0000764065-19-000072-xbrl.zip | 321378 | 2019-04-25 10:55:33 |
| clf-20190331.xml | 3809787 | 2019-04-25 10:55:33 |
| clf-20190331.xsd | 72487 | 2019-04-25 10:55:33 |
| clf-20190331_cal.xml | 99848 | 2019-04-25 10:55:33 |
| clf-20190331_def.xml | 474510 | 2019-04-25 10:55:33 |
| clf-20190331_lab.xml | 848043 | 2019-04-25 10:55:33 |
| clf-20190331_pre.xml | 658342 | 2019-04-25 10:55:33 |
| clf-201933110xq.htm | 2023471 | 2019-04-25 10:55:33 |
| clf-201933110xqex101.htm | 178811 | 2019-04-25 10:55:33 |
| clf-201933110xqex102.htm | 105308 | 2019-04-25 10:55:33 |
| clf-201933110xqex311.htm | 14661 | 2019-04-25 10:55:33 |
| clf-201933110xqex312.htm | 14417 | 2019-04-25 10:55:33 |
| clf-201933110xqex321.htm | 9161 | 2019-04-25 10:55:33 |
| clf-201933110xqex322.htm | 8645 | 2019-04-25 10:55:33 |
| clf-201933110xqex95.htm | 62648 | 2019-04-25 10:55:33 |
 clf-logoa01a01a11.jpg | 19593 | 2019-04-25 10:55:33 |
| FilingSummary.xml | 65205 | 2019-04-25 10:55:33 |
| Financial_Report.xlsx | 112551 | 2019-04-25 10:55:33 |
| R1.htm | 27622 | 2019-04-25 10:55:33 |
| R10.htm | 98596 | 2019-04-25 10:55:33 |
| R11.htm | 30285 | 2019-04-25 10:55:33 |
| R12.htm | 14799 | 2019-04-25 10:55:33 |
| R13.htm | 28910 | 2019-04-25 10:55:33 |
| R14.htm | 118677 | 2019-04-25 10:55:33 |
| R15.htm | 156361 | 2019-04-25 10:55:33 |
| R16.htm | 37076 | 2019-04-25 10:55:33 |
| R17.htm | 20033 | 2019-04-25 10:55:33 |
| R18.htm | 7962 | 2019-04-25 10:55:33 |
| R19.htm | 30977 | 2019-04-25 10:55:33 |
| R2.htm | 88424 | 2019-04-25 10:55:33 |
| R20.htm | 87367 | 2019-04-25 10:55:33 |
| R21.htm | 55882 | 2019-04-25 10:55:33 |
| R22.htm | 7722 | 2019-04-25 10:55:33 |
| R23.htm | 77582 | 2019-04-25 10:55:33 |
| R24.htm | 20116 | 2019-04-25 10:55:33 |
| R25.htm | 38222 | 2019-04-25 10:55:33 |
| R26.htm | 42997 | 2019-04-25 10:55:33 |
| R27.htm | 8238 | 2019-04-25 10:55:33 |
| R28.htm | 6625 | 2019-04-25 10:55:33 |
| R29.htm | 632078 | 2019-04-25 10:55:33 |
| R3.htm | 20964 | 2019-04-25 10:55:33 |
| R30.htm | 27114 | 2019-04-25 10:55:33 |
| R31.htm | 19390 | 2019-04-25 10:55:33 |
| R32.htm | 100058 | 2019-04-25 10:55:33 |
| R33.htm | 21097 | 2019-04-25 10:55:33 |
| R34.htm | 15631 | 2019-04-25 10:55:33 |
| R35.htm | 28045 | 2019-04-25 10:55:33 |
| R36.htm | 127510 | 2019-04-25 10:55:33 |
| R37.htm | 145993 | 2019-04-25 10:55:33 |
| R38.htm | 34556 | 2019-04-25 10:55:33 |
| R39.htm | 16034 | 2019-04-25 10:55:33 |
| R4.htm | 76137 | 2019-04-25 10:55:33 |
| R40.htm | 32793 | 2019-04-25 10:55:33 |
| R41.htm | 86333 | 2019-04-25 10:55:33 |
| R42.htm | 58033 | 2019-04-25 10:55:33 |
| R43.htm | 79111 | 2019-04-25 10:55:33 |
| R44.htm | 18427 | 2019-04-25 10:55:33 |
| R45.htm | 38965 | 2019-04-25 10:55:33 |
| R46.htm | 45371 | 2019-04-25 10:55:33 |
| R47.htm | 630450 | 2019-04-25 10:55:33 |
| R48.htm | 12739 | 2019-04-25 10:55:33 |
| R49.htm | 11675 | 2019-04-25 10:55:33 |
| R5.htm | 20534 | 2019-04-25 10:55:33 |
| R50.htm | 59108 | 2019-04-25 10:55:33 |
| R51.htm | 13328 | 2019-04-25 10:55:33 |
| R52.htm | 4361 | 2019-04-25 10:55:33 |
| R53.htm | 16254 | 2019-04-25 10:55:33 |
| R54.htm | 19702 | 2019-04-25 10:55:33 |
| R55.htm | 11420 | 2019-04-25 10:55:33 |
| R56.htm | 31350 | 2019-04-25 10:55:33 |
| R57.htm | 4365 | 2019-04-25 10:55:33 |
| R58.htm | 13967 | 2019-04-25 10:55:33 |
| R59.htm | 40906 | 2019-04-25 10:55:33 |
| R6.htm | 57585 | 2019-04-25 10:55:33 |
| R60.htm | 9467 | 2019-04-25 10:55:33 |
| R61.htm | 21048 | 2019-04-25 10:55:33 |
| R62.htm | 22955 | 2019-04-25 10:55:33 |
| R63.htm | 39706 | 2019-04-25 10:55:33 |
| R64.htm | 27371 | 2019-04-25 10:55:33 |
| R65.htm | 38806 | 2019-04-25 10:55:33 |
| R66.htm | 32648 | 2019-04-25 10:55:33 |
| R67.htm | 24016 | 2019-04-25 10:55:33 |
| R68.htm | 9652 | 2019-04-25 10:55:33 |
| R69.htm | 17629 | 2019-04-25 10:55:33 |
| R7.htm | 50066 | 2019-04-25 10:55:33 |
| R70.htm | 16412 | 2019-04-25 10:55:33 |
| R71.htm | 12052 | 2019-04-25 10:55:33 |
| R72.htm | 15874 | 2019-04-25 10:55:33 |
| R73.htm | 12160 | 2019-04-25 10:55:33 |
| R74.htm | 26551 | 2019-04-25 10:55:33 |
| R75.htm | 13155 | 2019-04-25 10:55:33 |
| R76.htm | 21693 | 2019-04-25 10:55:33 |
| R77.htm | 21440 | 2019-04-25 10:55:33 |
| R78.htm | 22363 | 2019-04-25 10:55:33 |
| R79.htm | 19742 | 2019-04-25 10:55:33 |
| R8.htm | 25059 | 2019-04-25 10:55:33 |
| R80.htm | 29156 | 2019-04-25 10:55:33 |
| R81.htm | 32739 | 2019-04-25 10:55:33 |
| R82.htm | 9465 | 2019-04-25 10:55:33 |
| R83.htm | 13641 | 2019-04-25 10:55:33 |
| R84.htm | 11270 | 2019-04-25 10:55:33 |
| R85.htm | 9682 | 2019-04-25 10:55:33 |
| R86.htm | 18720 | 2019-04-25 10:55:33 |
| R87.htm | 22498 | 2019-04-25 10:55:33 |
| R88.htm | 47367 | 2019-04-25 10:55:33 |
| R89.htm | 9071 | 2019-04-25 10:55:33 |
| R9.htm | 7323 | 2019-04-25 10:55:33 |
| R90.htm | 12197 | 2019-04-25 10:55:33 |
| R91.htm | 8956 | 2019-04-25 10:55:33 |
| R92.htm | 131307 | 2019-04-25 10:55:33 |
| R93.htm | 83918 | 2019-04-25 10:55:33 |
| R94.htm | 75625 | 2019-04-25 10:55:33 |
| R95.htm | 7933 | 2019-04-25 10:55:33 |
| R9999.htm | 4450 | 2019-04-25 10:55:33 |
| report.css | 2768 | 2019-04-25 10:55:33 |
| Show.js | 1086 | 2019-04-25 10:55:33 |