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Share-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of share-based payment award, restricted stock units, valuation assumptions
 
Fair Value Assumptions
Valuation date
February 1, 2019
Expected share price volatility
19.0%
Risk-free interest rate
2.48%
Fair value per share on valuation date
72.57