"When Trudeau took office in 1968 Canada had a debt of $18 billion (24% of GDP) which was largely left over from World War II, when he left office in 1984, that debt stood at $200 billion (46% of GDP), an increase of 83% in real terms. However, these trends were present in most western countries at the time, including the United States."
https://en.m.wikipedia.org/wiki/Pierre_Trudeau
Ummm, he did quite a bit more damage than "double the debt". Your understanding of "the most simple of mathematics" should show you this.
Since you're so handy with figures, you can break down the PDF document included in the wiki article. I simply can't be bothered. If you're really ambitious, you could even translate those figures into today's numbers and give us all a clearer picture of how Trudeau Sr. wasn't fiscally irresponsible.
I'm going to guess you're either too young to remember the '70's and '80's or are willfully forgetting them. Either way, they weren't particularly easy times. I do understand that things were tough all over, which is why I included the last sentence of the quote.
I hope you have a great day!