You should declare your view variables in the module.php file.
In this case, it is a named var (as opposed to positional ones), so you should add something like this:
$ViewList = array(
'telecharger' => array(
// other stuff here... 'unordered_params' => array( 'document' => 'document' )
Then you recover them as $document= (string) $Params['document'];
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