The Idea detail via includes my list of To Dos for that idea I am working on. When I add the Idea Detail to a notebook it does not publish the to do list. My idea is to allow for to dos to be added to a not book by feature, release or idea.
The page is currently designed in this way to exclude To-do's and Comments as these are additional tasks related to the record (as opposed to items which help to describe the record).
One workaround would be to take a screenshot of the page, paste it into a Note, and add the Note to a Notebook. This would allow you to show your To-do's in a Notebook (though live changes would not be reflected in your notebook).
Based on the above note on the rationale behind the current design, we are unlikely to make changes in this area. We hope you can understand and that the workaround will work for you.