Q. Detailed financials for European companies?

There are many resources for European companies.  Below are a handful. 

• Worldscope: fundamental data for public international companies. Searchable by company name, country, exchange, or fundamental items. 1980+.  However, survivor biased prior to 1985/1986. Available through WRDS.
• Compustat Global: detailed fundamental data for public companies trading on international exchanges. Special files are available that contain financial services data, currency translations, and market data. Annual data date back to 1987 . Canada and the USA are not included, for those countries use Compustat North America. Available through WRDS. 

• Orbis. *: Includes information on over 469 million companies about half of which include some financial information.  Scope is global representing 207 countries including private companies.  Also available through WRDS.** See How to Construct Nationally Representative Firm Level Data from the Orbis Global Database: New Facts and Aggregate Implications. NBER Working Paper No. 21558. ORBIS is survivor biased.  The current database contains header data and companies are dropped after roughly 10 years if not active.

  ORBIS Historical (point in time snapshots of ORBIS back to 2020).  Ownership files go back to 2007.   Each delivery of data includes all the years; however, descriptive data is not cumulative or historical.  It is a snapshot of each period and therefore is header data that cannot be used for historical industry or geography. Detailed cash flow and interim data is not cumulative or historical and is a snapshot of each period.  Global format including histories are cumulative files with data back to 1997 with the exception of finance and industry that is current only.  Coverage for each country begins at different points in time. Each instance is approximately 250 GB highly compressed.  One should have at least 3TB of space to work with each snapshot.  University of Maryland has an excellent description of the data along with helpful hints for interpreting the records and selecting variables.