A source tells EW that the two "are friends and this is amicable." Dermot Mulroney and Prima Apollinaare are ending their marriage after a decade and a half. The Chicago Fire star signed a petition for divorce from Apollinaare on Saturday,

Mulroney not only requested that Apollinaare pay him spousal support, but he also asked that the court terminate its ability to award her any financial support from him, the divorce docs revealed.

The divorce was filed on June 21, according to People. The “Chicago Fire” actor “cited irreconcilable differences” in the document and asked for joint custody of their two daughters, Mabel Ray, 17, and Sally June, 15. The listed separation date is “TBD.”