The phrase "amicable separation" means that when two people decide to end their relationship, they do so peacefully and without any major conflicts or disagreements. Full definition
But when children are involved, it can be a very difficult transitioning process — no matter how amicable the separation. (qaeducation.co.uk)
Nobody ever said that going through a divorce would be easy, and some of the most amicable separations have the potential to quickly turn messy and bitter. (divorceattorneynyc.com)