You have a lovely white columbine, possibly Snow Queen (Aquilegia ‘Schneekonigin’). Columbines will bloom from late spring to early summer. Though perennial, each plant will likely only live for a few years. However, they are prodigious seeders and will fill a garden space with more flowers. They are pretty tolerant of most conditions and add a great splash of colour to any garden.
Click here for an interesting link on columbines native to Canada: