I also hate American-centrism but it seems kinda justified here - they do go out of their way to mention ESA and CSA at the end, as well.

From that article:

  NASA's lifetime cost for the project is[when?] expected to be US$9.7 billion, of which US$8.8 billion was spent on spacecraft design and development and US$861 million is planned to support five years of mission operations.[112] Representatives from ESA and CSA stated their project contributions amount to approximately €700 million and CA$200 million, respectively.[113]

So it's 7.0% European, 1.5% Canadian, and 91.5% American (at current exchange rates). My takeaway is: good for Canada!!