Unable to use builtin traits From and PartialOrd for Box object bounds

Admittedly, I'm fairly new to Rust, but I love what I'm seeing so far. That said, I'm running into an issue where I'm getting the error:

error: only the builtin traits can be used as closure or object bounds [E0225]
defaults: HashMap<String, Box<Any + From<String> + PartialOrd>>,
                                    ^~~~~~~~~~~~

for the following code:

pub struct Builder {                                                                                                                                                                                                                           
    defaults: HashMap<String, Box<Any + From<String> + PartialOrd>>,                                                                                                                                                                           
    ...
}

If I remove the bound on From I get the same error but for PartialOrd. I don't understand why since I'm fairly certain both From and PartialOrd are builtin traits. Any help would be appreciated.