Employee Benefit Plans - Defined Contribution Savings Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined contribution saving plan costs recorded	$ 41.6	$ 45.1	$ 37.8
401(k) savings plan
Defined Benefit Plan Disclosure [Line Items]
Defined contribution saving plan costs recorded	39.0	42.6	35.5
ERSP
Defined Benefit Plan Disclosure [Line Items]
Defined contribution saving plan costs recorded	$ 2.7	$ 2.5	$ 2.3