I couldn't comment of the budget figures. But usually with international projects the project is required to spend the budget in-line with contributions it receives from it's members. So if the USA contributes 9 1/6 % of the budget, then the project has to buy 9 1/6 % of it's stuff from the USA. This usually adds a whole load of management overhead, along with making sure different stuff from different countries all works together. This, the delays, and that it is cutting edge science usually results in spiralling budgets and timescales.
The biggest winner in international projects tends to be the host country, as they end up with a load of boffins spending their pay in the area where the project is located. But everyone involved in the project benefits, after all the money doesn't just disappear, it is spent on employing folks to do things.