diff --git a/scrapy/statscollectors.py b/scrapy/statscollectors.py
index 1f9894519..69108fa32 100644
--- a/scrapy/statscollectors.py
+++ b/scrapy/statscollectors.py
@@ -69,7 +69,11 @@ class StatsCollector:
         self._stats = stats
 
     def inc_value(
-        self, key: str, count: int = 1, start: int = 0, spider: Spider | None = None
+        self,
+        key: str,
+        count: float = 1,
+        start: float = 0,
+        spider: Spider | None = None,
     ) -> None:
         d = self._stats
         d[key] = d.setdefault(key, start) + count
@@ -123,7 +127,11 @@ class DummyStatsCollector(StatsCollector):
         pass
 
     def inc_value(
-        self, key: str, count: int = 1, start: int = 0, spider: Spider | None = None
+        self,
+        key: str,
+        count: float = 1,
+        start: float = 0,
+        spider: Spider | None = None,
     ) -> None:
         pass