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Equity Based Compensation
3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Equity Based Compensation
Equity Based Compensation
Equity compensation expense was $7.6 million and $9.7 million for the three months ended March 31, 2019 and 2018, respectively. In the first quarter of 2019, the Company granted 0.2 million stock appreciation rights at $145.25 weighted average exercise price per share and 0.1 million performance contingent units to employees. As of March 31, 2019, 1.6 million share options at a weighted average strike price per share of $74.36 were vested and exercisable, with a remaining weighted average exercise period of 4.5 years. As of March 31, 2019, the total compensation cost of non-vested awards not yet recognized in the condensed consolidated financial statements was $32.8 million. It is estimated that these costs will vest over a weighted average period of 1.2 years.