Pension and Postretirement Benefit Plans (Schedule of net periodic benefit costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Pension | International
Components of net periodic benefit costs
Service cost	$ 0.0
Interest cost	8.0
Expected return on plan assets	(17.9)
Prior service cost (credit) amortization	0.0
Actuarial loss (gain) amortization	0.0
Settlement charge	0.2
Net periodic benefit costs (credit)	(9.7)
Pension | Domestic
Components of net periodic benefit costs
Service cost	13.0	$ 12.5	$ 11.9
Interest cost	5.9	4.9	5.9
Expected return on plan assets	(10.5)	(9.2)	(11.0)
Prior service cost (credit) amortization	0.3	0.2	0.2
Actuarial loss (gain) amortization	2.0	3.6	0.6
Settlement charge	0.0	0.0	5.6
Net periodic benefit costs (credit)	10.7	12.0	13.2
Postretirement
Components of net periodic benefit costs
Service cost	0.1	0.1	0.1
Interest cost	0.3	0.3	0.4
Expected return on plan assets	0.0	0.0	0.0
Prior service cost (credit) amortization	(0.4)	(0.4)	(0.4)
Actuarial loss (gain) amortization	(0.3)	(0.3)	(0.7)
Settlement charge	0.0	0.0	0.0
Net periodic benefit costs (credit)	$ (0.3)	$ (0.3)	$ (0.6)