Pension and Postretirement Benefit Plans (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Pension | United States
Components of net periodic benefit costs
Service cost	$ 9.3	$ 9.7	$ 11.5
Interest cost	3.3	5.1	6.5
Expected return on plan assets	(7.8)	(9.2)	(9.7)
Prior service cost amortization	0.4	0.5	0.5
Actuarial loss (gain) amortization	2.6	2.8	1.9
Settlement charges (credit)	1.1	13.0	2.7
Contractual termination benefits	0.0	0.0	1.3
Net periodic benefit costs (credit)	8.9	21.9	14.7
Pension | International
Components of net periodic benefit costs
Service cost	0.0	0.0	0.1
Interest cost	10.0	14.4	16.9
Expected return on plan assets	(16.9)	(18.4)	(31.5)
Prior service cost amortization	0.2	0.2	0.0
Actuarial loss (gain) amortization	0.0	0.0	0.0
Settlement charges (credit)	0.0	1.2	(4.1)
Contractual termination benefits	0.0	0.0	0.0
Net periodic benefit costs (credit)	(6.7)	(2.6)	(18.6)
Postretirement
Components of net periodic benefit costs
Service cost	0.0	0.0	0.0
Interest cost	0.2	0.3	0.3
Expected return on plan assets	0.0	0.0	0.0
Prior service cost amortization	0.0	0.0	0.0
Actuarial loss (gain) amortization	(0.3)	(0.5)	(0.6)
Settlement charges (credit)	0.0	0.0	0.0
Contractual termination benefits	0.0	0.0	0.0
Net periodic benefit costs (credit)	$ (0.1)	$ (0.2)	$ (0.3)