Can anyone tell me what plant this is

I have many of these plants in pots, as you can see below, and we don't know the name of the plant.  We divided the original one about 2 years ago and this is the first year they have flowered.  I can't remember buying the plant so maybe someone gave it to me but it sure looks beautiful now in flower.

Can anyone tell me it's name please?  Remember though that I am in Australia so it is Autumn (Fall) here and not Spring.