Pension and Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Pension Benefits | UNITED STATES
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 2.3	$ 2.5
Interest cost	0.8	1.4
Expected return on plan assets	(2.0)	(2.4)
Prior service cost amortization	0.1	0.1
Actuarial loss (gain) amortization	0.7	0.6
Net periodic benefit costs (credit)	1.9	2.2
Pension Benefits | Foreign Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost	2.3	3.6
Expected return on plan assets	(3.8)	(4.6)
Net periodic benefit costs (credit)	(1.5)	(1.0)
Postretirement Benefits | UNITED STATES
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost	0.1	0.0
Actuarial loss (gain) amortization	(0.1)	(0.1)
Net periodic benefit costs (credit)	$ 0.0	$ (0.1)