Cloud Security
Here's your answer.
Search for "Cloud Security Governance - Australian Cyber Security Centre". I can't provide a URL until I've posted 10 times, this is my first. Guidelines for Federal Gov in procuring cloud services.
I would suggest if you're not happy with it for CASA stuff - you'd be even unhappier with where your other Gov data resides. The CASA stuff is more than likely in the Microsoft Azure instance in the Canberra Data Centres, IRAP'ed to PROTECTED level. Probably a lot safer than where it was stored in a poorly managed traditional infrastructure based data centre.