Pension and Postretirement Benefit Plans (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Pension | Domestic
Components of net periodic benefit costs
Service cost	$ 11.5	$ 13.0	$ 12.5
Interest cost	6.5	5.9	4.9
Expected return on plan assets	(9.7)	(10.5)	(9.2)
Prior service cost (credit) amortization	0.5	0.3	0.2
Actuarial loss (gain) amortization	1.9	2.0	3.6
Settlement charge (credit)	2.7	0.0	0.0
Contractual termination benefits	1.3	0.0	0.0
Net periodic benefit costs (credit)	14.7	10.7	12.0
Pension | International
Components of net periodic benefit costs
Service cost	0.1	0.0
Interest cost	16.9	8.0
Expected return on plan assets	(31.5)	(17.9)
Prior service cost (credit) amortization	0.0	0.0
Actuarial loss (gain) amortization	0.0	0.0
Settlement charge (credit)	(4.1)	0.2
Contractual termination benefits	0.0	0.0
Net periodic benefit costs (credit)	(18.6)	(9.7)
Postretirement
Components of net periodic benefit costs
Service cost	0.0	0.1	0.1
Interest cost	0.3	0.3	0.3
Expected return on plan assets	0.0	0.0	0.0
Prior service cost (credit) amortization	0.0	(0.4)	(0.4)
Actuarial loss (gain) amortization	(0.6)	(0.3)	(0.3)
Settlement charge (credit)	0.0	0.0	0.0
Contractual termination benefits	0.0	0.0	0.0
Net periodic benefit costs (credit)	$ (0.3)	$ (0.3)	$ (0.3)