Reclassifications from Accumulated Other Comprehensive (Loss) Income - Schedule of Amounts Reclassified from AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Amount reclassified from AOCI
Cost of sales	$ 1,470.4	$ 1,822.4	$ 1,935.4
Net sales	1,475.6	2,181.1	2,380.2
Interest expense	32.7	19.8	26.0
Other expense (income), net	(8.4)	0.6	0.6
Income (expense) benefit	68.3	(4.6)	(49.0)
Net (loss) income	(229.6)	1.5	$ 167.0
Cash flow hedging items | Amount Reclassified from AOCI
Amount reclassified from AOCI
Income before income taxes	7.0	12.7
Income (expense) benefit	(1.7)	(3.1)
Net (loss) income	5.3	9.6
Cash flow hedging items | Amount Reclassified from AOCI | Commodity contracts
Amount reclassified from AOCI
Cost of sales	6.6	11.5
Cash flow hedging items | Amount Reclassified from AOCI | Foreign exchange contracts
Amount reclassified from AOCI
Net sales	0.0	0.8
Cash flow hedging items | Amount Reclassified from AOCI | Forward interest rate swaps
Amount reclassified from AOCI
Interest expense	0.4	0.4
Net actuarial loss | Amount Reclassified from AOCI
Amount reclassified from AOCI
Other expense (income), net	(18.9)	(18.0)
Prior service cost | Amount Reclassified from AOCI
Amount reclassified from AOCI
Other expense (income), net	1.8	1.8
Settlement charge | Amount Reclassified from AOCI
Amount reclassified from AOCI
Other expense (income), net	(11.4)	0.0
Pension and other postretirement benefit plan items | Amount Reclassified from AOCI
Amount reclassified from AOCI
Income before income taxes	(28.5)	(16.2)
Income (expense) benefit	6.9	3.9
Net (loss) income	$ (21.6)	$ (12.3)