Restructuring Accruals (Schedule of Changes in the Restructuring Accrual) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Restructuring Reserve [Roll Forward]
Reversal of excess accrual	$ (2.2)	$ (1.8)	$ (6.0)
Employee Terminations
Restructuring Reserve [Roll Forward]
Balance at beginning of year	10.7	43.7
Accruals	14.6	18.1
Cash payments	(18.8)	(49.3)
Reversal of excess accrual	(2.2)	(1.8)
Balance at end of year	$ 4.3	$ 10.7	$ 43.7