Turner publishes books in a wide range of categories and formats—fiction and non-fiction. They publish mainly in print but have electronic options as well. They are a major independent publishing house that has a number of imprints. They publish everything from mystery to self help books.
They have published a number of well-known authors and bestselling books. They have good distribution. Their website is easy to navigate and well designed.
All submissions must be made through email. They are open to agented or unagented submissions. They will contact you if they are interested, otherwise do not expect to hear from them. They are rather blunt about that. Unfortunately, they do not have any information around average turnaround time, but they allow simultaneous submissions.
To learn more about them I really encourage you to browse their catalog.
You can see their submission guidelines here.
