Depends on what she does with the money. If they get along after the divorce she might want to invest in some of Mels projects. I expect that is what he will do with his money. You don’t need 400 million to live on the rest of his actuarial life so if he has some projects in mind I bet he’ll pursue them. It’s hard enough to get a divorce without it being all over the Tabloids so I wish them both luck. 28 years is a long time to live with someone you find you don’t love.
Why does it depend on what she does with the money? The law says half of what is in the bank is his, half is hers - no statement of intent to spend is needed.