Employee Benefit Plans - Defined Contribution Savings Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Saving Plan costs recorded	$ 45.1	$ 37.8	$ 36.3
401(k) savings plan
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Saving Plan costs recorded	42.6	35.5	34.4
ERSP
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Saving Plan costs recorded	$ 2.5	$ 2.3	$ 1.9