The premium TV scene in Canada is different. Western Canada gets the Corus owned Movie Central and Eastern Canada gets Bell Media owned Movie Network. Both have the same general movie library but are independent of each other. They used to be direct competitors in the 80s but eventually they decided to stop competing and divide their territory. In 2008 they entered into a joint licensing deal with HBO and they each converted one of their multiplex channels into HBO Canada. Movie Central and Movie Network remain the main channels with movie premieres, but most of the HBO series now air on HBO Canada while the Movie Network and Movie Central air some Showtime series. They also have their own classic movie channels Encore Avenue and The Movie Network Encore, similar to what Flix is to Showtime.
There's another newer nationwide premium service caleld Super Channel which launched around the same time. It has the first run rights to Fox's movies and also has some series from Starz, Showtime and some UK networks.
Technically the Family Channel (their version of the Disney Channel) is also a premium channel, however it's now widely distributed on expanded basic, but they still are commercial free and break free.
Showcase isn't a premium channel. It's a basic cable channel with dramas, original series from channels like TNT and USA and some off network reruns from their sister channel Global.