as of 30 september 2018 , there was $ .1 of unrecognized compensation cost related to restricted stock awards . the cost is expected to be recognized over a weighted average period of 0.5 years . the total fair value of restricted stock vested during fiscal years 2018 , 2017 , and 2016 was $ 2.2 , $ 4.1 , and $ 4.3 , respectively . as discussed in note 3 , discontinued operations , air products completed the spin-off of versum on 1 october 2016