Employee Retirement Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
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	$ 10.0	$ 10.5	$ 9.9
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	$ 6.7	5.0	4.3
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	$ 2.6	$ 2.2	$ 1.7