I believe that once married a couple should split everything. From the day of marriage.
but if you have so much before marriage like being famous and say you have millions or you own several properties then the amount you have to split if you were to stay together or separate should only by 50/50 from what is earned once you became a married couple.
The reason I say this is because so many famous people get married then when some get divorced the partner wants half of everything which is wrong if they have worked hard to earn before marriage.