Well I would have said Peony but not with those leaves which look more like mallow but not with those flowers! So I will follow this and see what they are?

Well i thought that but could it be a hollyhock ?

Any chance it might be a particularly splendid double pelargonium?

I'm with Andy - double flowered form of Hollyhock, by the look of the foliage

I have double flowered hollyhocks and that looks like them.They have flowered for months and still going

Hollyhock :o)