code: public static final Renderer<Double> instance() { // NOPMD it's thread save!
      if (CurrencyDoubleRenderer.instanceRenderer == null) {
        synchronized (CurrencyDoubleRenderer.class) {
          if (CurrencyDoubleRenderer.instanceRenderer == null) {
            CurrencyDoubleRenderer.instanceRenderer = new CurrencyDoubleRenderer();
          }
        }
      }
      return CurrencyDoubleRenderer.instanceRenderer;
    }
docs: returns the instance.
  
  @return CurrencyDoubleRenderer