diff --git a/src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php b/src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php
index 167998411eec..ed05d8448ef3 100755
--- a/src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php
+++ b/src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php
@@ -1061,14 +1061,18 @@ protected function setTimestampsOnAttach(array $record, $exists = false)
     /**
      * Detach models from the relationship.
      *
-     * @param  int|array  $ids
+     * @param  mixed  $ids
      * @param  bool  $touch
      * @return int
      */
     public function detach($ids = [], $touch = true)
     {
         if ($ids instanceof Model) {
-            $ids = (array) $ids->getKey();
+            $ids = $ids->getKey();
+        }
+
+        if ($ids instanceof Collection) {
+            $ids = $ids->modelKeys();
         }
 
         $query = $this->newPivotQuery();
@@ -1079,7 +1083,7 @@ public function detach($ids = [], $touch = true)
         $ids = (array) $ids;
 
         if (count($ids) > 0) {
-            $query->whereIn($this->otherKey, (array) $ids);
+            $query->whereIn($this->otherKey, $ids);
         }
 
         // Once we have all of the conditions set on the statement, we are ready
diff --git a/tests/Database/DatabaseEloquentBelongsToManyTest.php b/tests/Database/DatabaseEloquentBelongsToManyTest.php
index e49663836fa0..7bcedb04a9e0 100755
--- a/tests/Database/DatabaseEloquentBelongsToManyTest.php
+++ b/tests/Database/DatabaseEloquentBelongsToManyTest.php
@@ -281,6 +281,27 @@ public function testDetachWithSingleIDRemovesPivotTableRecord()
         $this->assertTrue($relation->detach([1]));
     }
 
+    public function testDetachMethodConvertsCollectionToArrayOfKeys()
+    {
+        $relation = $this->getMock('Illuminate\Database\Eloquent\Relations\BelongsToMany', ['touchIfTouching'], $this->getRelationArguments());
+        $query = m::mock('stdClass');
+        $query->shouldReceive('from')->once()->with('user_role')->andReturn($query);
+        $query->shouldReceive('where')->once()->with('user_id', 1)->andReturn($query);
+        $query->shouldReceive('whereIn')->once()->with('role_id', [1, 2, 3]);
+        $query->shouldReceive('delete')->once()->andReturn(true);
+        $relation->getQuery()->shouldReceive('getQuery')->andReturn($mockQueryBuilder = m::mock('StdClass'));
+        $mockQueryBuilder->shouldReceive('newQuery')->once()->andReturn($query);
+        $relation->expects($this->once())->method('touchIfTouching');
+
+        $collection = new Collection([
+            m::mock(['getKey' => 1]),
+            m::mock(['getKey' => 2]),
+            m::mock(['getKey' => 3]),
+        ]);
+
+        $this->assertTrue($relation->detach($collection));
+    }
+
     public function testDetachMethodClearsAllPivotRecordsWhenNoIDsAreGiven()
     {
         $relation = $this->getMock('Illuminate\Database\Eloquent\Relations\BelongsToMany', ['touchIfTouching'], $this->getRelationArguments());