Toni Collette and Dave Galafassi Decided to Divorce After 'Substantial Period of Separation'

Toni Collette and estranged husband Dave Galafassi are clarifying that their decision to divorce came after a separation.

On Wednesday, the Hereditary actress, 50, and Galafassi, 44, announced their split after 20 years of marriage in a statement on Instagram.

The message has since been edited to begin, "After a substantial period of separation, it is with grace and gratitude that we announce we are divorcing."

"We're united in our decision and part with continuing respect and care for each other," they added. "Our kids are of paramount importance to us and we will continue to thrive as a family, albeit a different shape. We're thankful for the space and love you grant us as we evolve and move through this transition peacefully. Big thanks."

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Collette and Galafassi share daughter Sage Florence, 14, and son Arlo Robert, 11.

Before the announcement post, Collette shared a quote on her Instagram Story that read: "No matter what your current circumstances are, if you can imagine something better for yourself, you can create it."

The initial announcement came as photos of Galafassi and another woman kissing at a beach the day before in Sydney, Australia, surfaced. The Daily Mail published the photos that also show the musician and the woman sitting together, holding hands in the water, and sharing multiple kisses.

Reps for Collette did not respond to PEOPLE's request for comment. A rep for Galfassi could not immediately be located.