Might be Poison Hemlock. If it is, the stems will have purple blotching. Can you get back for a second look?

Thanks noinwi.
My husband got a look at it and it does have purple blotching towards the bottom of the stems. I brought a sample to the house to compare with images, and I think you're right. We've lived here 30 years and that's the first time we've seen it. I think I should cut it down. We have so many invasives here already, we definitely don't want another one!
Too bad though, its pretty attractive.
I've sent a pic to our ag agent, so I'll see what he thinks too. He'll also be able to tell me how common it is here in Indiana.
Thanks for your help!