Google Analytics collects the information it normally does, as well as the DoubleClick cookie when that cookie is present in relation to display advertising tracking.
https://support.google.com/analytics/answer/2444872
Analytics and Tracking · Advertiser Tracking
Get access to data on 1,652,213 websites that are Google Analytics with Ad Tracking Customers. We know of 239,053 live websites using Google Analytics with Ad Tracking and an additional 1,413,160 sites that used Google Analytics with Ad Tracking historically and 120,465 websites in the United States.
Get a list of 1,652,213 websites using Google Analytics with Ad Tracking which includes location information, hosting data, contact details, 239,053 currently live websites and an additional 343,163 domains that redirect to sites in this list. 1,413,160 sites that used this technology previously and 120,465 websites in the United States currently using Google Analytics with Ad Tracking.