The split was a result of the American parent refusing to an Ontario Court Order to pay benefits to former employees:
http://www.theglobeandmail.com/report-on-business/industry-news/energy-and-resources/new-bids-likely-after-us-steel-canada-splits-from-parent-company/article26767145/?service=mobile
So bids will be undertaken for the Canadian branch without the American one participating.