Case C-219/17: Judgment of the Court (Grand Chamber) of 19 December 2018 (request for a preliminary ruling from the Consiglio di Stato — Italy) — Silvio Berlusconi, Finanziaria d’investimento Fininvest SpA (Fininvest) v Banca d’Italia, Istituto per la Vigilanza Sulle Assicurazioni (IVASS) (Reference for a preliminary ruling — Approximation of laws — Prudential supervision of credit institutions — Acquisition of a qualifying holding in a credit institution — Procedure governed by Directive 2013/36/EU and by Regulations (EU) No 1024/2013 and No 468/2014 — Composite administrative procedure — Exclusive decision-making power of the European Central Bank (ECB) — Action brought against preparatory acts adopted by the national competent authority — Claim that the force of res judicata attaching to a national decision has been disregarded)