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 1,063,208 websites that are Google Analytics with Ad Tracking Customers. We know of 43,741 live websites using Google Analytics with Ad Tracking and an additional 1,019,467 sites that used Google Analytics with Ad Tracking historically and 19,770 websites in the United States.
Google Analytics with Ad Tracking websites that are also using other technologies.
Get a list of 1,063,208 websites using Google Analytics with Ad Tracking which includes location information, hosting data, contact details, 43,741 currently live websites and an additional 82,655 domains that redirect to sites in this list. 1,019,467 sites that used this technology previouslyand 19,770 websites in the United States currently using Google Analytics with Ad Tracking.
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