In Eclipse, most of the coverage plugins, display covered/partially covered/uncovered lines with different colors (i.e. the whole line painted with a color)
I think the UI has been updated the the way to get to this option has changed. While it is already mentioned by others, I'd like to elaborate with a more detailed image to make it easier to see.
Intellij > Preferences > Editor > Color Scheme > General > Line Coverage >
There you will have three options.
Here is the menu option:
And here is what the question is specifically looking for: