Perhaps this is why:

http://ir.bombardier.com/en/preferred-series-3
An unlimited number of non-voting preferred shares, without nominal or par value.

Dividend
For the five-year period from August 1, 2012 and including July 31, 2017, the Series 3 Cumulative Redeemable Preferred Shares carry fixed cumulative preferential cash dividends at a rate of 3.134% or $0.7835 Cdn per share per annum, payable quarterly on the last day of January, April, July and October of each year at a rate of $0.195875 Cdn, if declared.
For each succeeding five-year period, the applicable fixed annual rate of the cumulative preferential cash dividends calculated by the Corporation shall not be less than 80% of the Government of Canada bond yield, as defined in the Articles of Incorporation.