Looks like a custom font based in Eras

Not exact, but close

Helvetica is probably the most common font in the world. There are several free alternatives. For instance, Aileron https://tipotype.com/aileron/ or Roboto https://fonts.google.com/specimen/Roboto

"Power" is in Gotham Book and "Secure" in Gotham Bold

Almost, but the endings of the S and C are different

You can inspect the page: http://www.eluniversal.com.mx/cartera/negocios/guerra-comercial-con-eu-hunde-al-tlcan-expertos
Select text, Right click with the mouse, -> Inspect Element, under "Typography" appears the font sed.

Another option is Dear Sir/Madam

It's a custom hand-made font. In 1996 Gill Facia was based on this design (http://luc.devroye.org/fonts-87611.html ).

Inspecting this PDF: https://www.jeuxavolonte.asso.fr/regles/le_donjon_de_naheulbeuk.pdf
it mentions

BDneoClairdeLune
Cafeteria
Cochin

Cafeteria and Cochin don't match, and I haven't found the first, but it is your font (if you select and copy%paste, you can see that it is in fact the font used).

The ampersand is slightly different, isn't it?

I think they are almost identical. Eurostile s just a bit taller.

https://i.imgur.com/SxskdWJ.png