Employee Benefit Plans - Other Post-employment Benefit Obligations (Details) - The Gratuity Plan - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit expense	$ 1.0	$ 1.3	$ 1.0
Benefit obligation	$ 6.4	$ 5.8	$ 5.0

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