diff --git a/django/db/models/expressions.py b/django/db/models/expressions.py
index 41443dc6db4..b67a2418d44 100644
--- a/django/db/models/expressions.py
+++ b/django/db/models/expressions.py
@@ -1267,12 +1267,12 @@ class ExpressionList(Func):
 
     def get_group_by_cols(self):
         group_by_cols = []
-        for partition in self.get_source_expressions():
-            group_by_cols.extend(partition.get_group_by_cols())
+        for expr in self.get_source_expressions():
+            group_by_cols.extend(expr.get_group_by_cols())
         return group_by_cols
 
 
-class OrderByList(Func):
+class OrderByList(ExpressionList):
     allowed_default = False
     template = "ORDER BY %(expressions)s"
 
@@ -1287,17 +1287,6 @@ class OrderByList(Func):
         )
         super().__init__(*expressions, **extra)
 
-    def as_sql(self, *args, **kwargs):
-        if not self.source_expressions:
-            return "", ()
-        return super().as_sql(*args, **kwargs)
-
-    def get_group_by_cols(self):
-        group_by_cols = []
-        for order_by in self.get_source_expressions():
-            group_by_cols.extend(order_by.get_group_by_cols())
-        return group_by_cols
-
 
 @deconstructible(path="django.db.models.ExpressionWrapper")
 class ExpressionWrapper(SQLiteNumericMixin, Expression):
diff --git a/tests/expressions_window/tests.py b/tests/expressions_window/tests.py
index fb14e563491..fd674e319bc 100644
--- a/tests/expressions_window/tests.py
+++ b/tests/expressions_window/tests.py
@@ -354,6 +354,29 @@ class WindowFunctionTests(TestCase):
             transform=lambda row: (row.name, row.bonus, row.department, row.lag),
         )
 
+    def test_order_by_decimalfield(self):
+        qs = Employee.objects.annotate(
+            rank=Window(expression=Rank(), order_by="bonus")
+        ).order_by("-bonus", "id")
+        self.assertQuerySetEqual(
+            qs,
+            [
+                ("Miller", 250.0, 12),
+                ("Johnson", 200.0, 11),
+                ("Wilkinson", 150.0, 10),
+                ("Smith", 137.5, 9),
+                ("Brown", 132.5, 8),
+                ("Adams", 125.0, 7),
+                ("Jones", 112.5, 5),
+                ("Jenson", 112.5, 5),
+                ("Johnson", 100.0, 4),
+                ("Smith", 95.0, 3),
+                ("Williams", 92.5, 2),
+                ("Moore", 85.0, 1),
+            ],
+            transform=lambda row: (row.name, float(row.bonus), row.rank),
+        )
+
     def test_first_value(self):
         qs = Employee.objects.annotate(
             first_value=Window(
@@ -1934,8 +1957,7 @@ class NonQueryWindowTests(SimpleTestCase):
         )
         self.assertEqual(
             repr(Window(expression=Avg("salary"), order_by=F("department").asc())),
-            "<Window: Avg(F(salary)) OVER (OrderByList(OrderBy(F(department), "
-            "descending=False)))>",
+            "<Window: Avg(F(salary)) OVER (OrderBy(F(department), descending=False))>",
         )
 
     def test_window_frame_repr(self):