Pension and Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits | UNITED STATES
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 2.5	$ 2.9	$ 5.0	$ 5.8
Interest cost	1.3	1.7	2.7	3.3
Expected return on plan assets	(2.4)	(2.5)	(4.8)	(4.9)
Prior service cost amortization	0.2	0.2	0.3	0.3
Actuarial loss (gain) amortization	0.6	0.5	1.2	1.0
Settlement charge	8.8	0.0	8.8	0.0
Net periodic benefit costs (credit)	11.0	2.8	13.2	5.5
Pension Benefits | Foreign Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0.0	0.1	0.0	0.1
Interest cost	3.7	4.3	7.3	8.6
Expected return on plan assets	(4.7)	(8.0)	(9.3)	(16.0)
Prior service cost amortization	0.1	0.0	0.1	0.0
Net periodic benefit costs (credit)	(0.9)	(3.6)	(1.9)	(7.3)
Postretirement Benefits | UNITED STATES
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost	0.1	0.1	0.1	0.2
Actuarial loss (gain) amortization	(0.2)	(0.2)	(0.3)	(0.3)
Net periodic benefit costs (credit)	$ (0.1)	$ (0.1)	$ (0.2)	$ (0.1)