Employee Retirement Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Australia Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of contribution by the company to the retirement plans	9.50%
Total contribution by the company to the employee retirement plans	$ 10.7	$ 9.5	$ 10.0
United States Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of contribution by the company to the retirement plans	4.00%
Total contribution by the company to the employee retirement plans	$ 9.6	9.3	6.7
Singapore Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of contribution by the company to the retirement plans	17.00%
Total contribution by the company to the employee retirement plans	$ 2.5	$ 2.9	$ 2.6