FredFri:
There is no distance (DME) requirement for ILS approaches in Canada.
The Middle and Outer Marker beacons has been decomissioned [here] for over 10 years.
The majority of ILS approaches don't have DME, but the majority do have an NDB as the Final Approach Fix (FAF)-usually about 4.5 to 5 nm from the threshold.
A decent to localizer ONLY minimums (in the event of GS failure) would be done on timing from the FAF, i.e.cross the beacon start the time , decend down to the LOC MDA, wait for the timing which corresponds to your ground speed, if nothing is seen at the end of time-Missed Approach.
Some ILS approaches have no fixes but require RADAR vectors to determine the IB Course , there are a couple of examples of these at YYZ .