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Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Retirement Benefits [Abstract]
Service cost	$ 6.2	$ 3.9	$ 18.6	$ 11.7
Interest cost	12.3	6.7	36.9	20.1
Expected return on plan assets	(18.0)	(8.3)	(54.0)	(24.9)
Amortization of net loss	1.5	1.0	4.5	3.0
Amortization of prior service credit	(0.4)	(0.5)	(1.2)	(1.5)
Curtailment credit	0.0	0.0	0.0	(0.3)
Net periodic benefit cost	$ 1.6	$ 2.8	$ 4.8	$ 8.1

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