You dont want to replace spaces in generated route, you want to not generate them in the first place.
What is your "International Ledger" ? If it is action, then use [ActionName("International-Ledger")]
If it is some kind of product or category of product, is it good practice dont use product name for URL, but some "token" generated from name, for example with regex, replacing spaces with dashes, special letters with theirs basic alphabet variants, and maybe some unique identifier to prevent conflicts of products with the same name.
see How can I create a SEO friendly dash-delimited url from a string?