The debt will be due in 2017 and interest terms will be announced later on Thursday.
The initial amount will be $500m, but the company can increase that by $100m, plus another $100m through an over-allotment for bookrunners.
"The proceeds of the issue will be used to finance the company’s growth and for general corporate purposes," it said.
The bonds will be convertible into shares and will carry interest somewhere between 0.5%
