Not having been in that position (sick for more than 7 days), I am not up to speed on all the benefits. I do know that we can be sick for a month and get 90% of our pay.
If we are sick for longer than one month we get disability (GDIIP) from the company and extended mutual aid (from ACPA). The combination of GDIIP and EMA should replace 80-90% of your income.
Don't hold me to these numbers though. Like I said, I've never had to use it so may not be totally familiar with all the benefits.