Segment Information - Reconciliation of Earnings/ (loss) from Continuing Operations to Ebitda (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting [Abstract]
Earnings/(loss) from continuing operations	$ 220.7	$ 137.4	$ 83.6
Total unallocated costs	145.9	142.9	138.8
Depreciation and amortization	253.7	228.6	190.1
Interest expense, net	126.1	110.9	111.4
Income tax expense	$ 39.7	$ 22.9	$ 68.4