The Company and Significant Accounting Policies - Government Grants (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Government Grants, Reduction Recorded To Interest Expense	$ 0.7	$ 0.1	$ 4.1	$ 0.1
Government Grants, Reduction Recorded To Property, Plant And Equipment	0.0		1.3
Government Grants, Reduction Recorded To Operating Expenses	$ 1.8		$ 2.0