Moving and Duplicating Layer Effects and Styles in Photoshop CC

To move Layer Effects from one layer to another, drag the fx icon (or the word Effects). To copy Layer Effects from one layer to another, Option -drag  (Mac) | Alt -drag (Win) the fx icon (or the word Effects).

To move an individual Layer Effect from one layer to another, drag the name of the individual effect (Stroke, Drop Shadow etc.). Add the Option  (Mac) | Alt  (Win) key to copy the individual effect from one layer to another.