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Share-based Compensation
9 Months Ended
Sep. 30, 2018
Share-based Compensation [Abstract]  
Share-based Compensation
Share-based Compensation
During the nine months ended September 30, 2018, we granted 0.19 stock options and 0.10 restricted stock units, 0.02 shares of restricted stock, and 0.02 performance units. The total fair value of awards granted to employees during the nine months ended September 30, 2018 was $12.5. In addition, non-employee directors received stock awards with a fair value of $0.5. During the nine months ended September 30, 2018, participants in our stock option plans exercised options to purchase 0.26 shares of our common stock, while 0.20 stock options were forfeited.
Stock options generally have a four-year graded vesting period. Restricted stock and restricted stock units generally vest ratably over a three-year period. Performance units generally vest at the end of a three-year performance period based on the attainment of certain pre-determined performance condition targets. During the nine months ended September 30, 2018, 0.14 shares of restricted stock and restricted stock units vested while 0.07 restricted stock units and 0.03 performance units were forfeited.
Share-based compensation expense was $0.5 and $1.4 for the three months ended September 30, 2018 and 2017, respectively. Share-based compensation expense was $3.5 and $9.1 for the nine months ended September 30, 2018 and 2017, respectively. Share-based compensation expense for the quarter and year includes a $0.9 million credit due to forfeitures related to headcount reductions associated with the strategic realignment of our segment structure. Furthermore, share-based compensation expense for the year includes a $1.8 credit due to forfeitures related to the departure of our former CEO on June 11, 2018. Share-based compensation expense is included in selling, general, and administrative expenses in the unaudited condensed consolidated statements of operations and comprehensive income. As of September 30, 2018, total share-based compensation of $6.2 is expected to be recognized over the weighted-average period of approximately 2.3 years.