What types of decisions?

Financial Powers of Attorney allow the attorney to make financial decisions for you, for instance if you go overseas they can pay bills for you, manage your finances and investments or even sign financial documents such as Contracts of Sale.
Medical Powers of Attorney specifically cover medical issues such as consent to treatment or whether or not to continue life support.
Enduring Guardianship applies if you become mentally incapacitated and allows the Attorney to make day to day decisions about matters such as where you live, management of your health care and who can visit you.