Filipendula Rubra, commonly called Queen of the Prairie

its more likely to be Eupatorium possibly E cannabinum.

I grew it for about 10 yrs and the bees and butterflies love it. gets to about 4-5ft tall if in well fed soil.

Agree, Eupatorium cannabinum, common name hemp agrimony. There's another one, Eupatorium purpureum, commonly known as joe pye weed, with darker pink flowers. Useful, taller, later flowering perennials - you don't see it much in gardens here, its not that common.

I found a large stand of it wild on the SW wales coast a couple of years ago - took ages to get it identified!

Seaburngirl is right - she usually is! lol