That's news to me
(that's) news to (one)
This is something I was not aware about or did not know. A: "Yeah, Jeff and Anthony have been going out for a few months now." B: "News to me. I thought they were just friends." You aren't allowed to dump your grass clippings here? Well, that's news to me!"
That's news to me.
I did not know that.; I had not been informed of that. Bill: They've blocked off Maple Street for some repairs. Tom: That's news to me. Sally: The telephones are out. None of them work. Bill: That's news to me.