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Share Capital, Option Plans and Share-Based Payments - Long-Term Incentive Plans (Details) - Long Term Incentive Plan
$ in Millions
3 Months Ended
Sep. 30, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Term of plan 3 years
Compensation cost related to unvested awards not yet recognized $ 27.1
Unvested stock awards compensation cost, weighted average recognition period 2 years 3 months 18 days