Reclassifications from Accumulated Other Comprehensive Loss - Schedule of Amounts Reclassified from AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ 52.3	$ (7.8)
Tax (expense)/benefit	(8.4)	0.9
Net income	43.9	(6.9)
Amount Reclassified from AOCI | Cash flow hedging items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	1.4	6.7
Tax (expense)/benefit	(0.4)	(1.6)
Net income	1.0	5.1
Amount Reclassified from AOCI | Pension and other postretirement benefit plan items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(1.1)	(1.5)
Tax (expense)/benefit	0.3	0.5
Net income	(0.8)	(1.0)
Amount Reclassified from AOCI | Net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other	(1.6)	(2.0)
Amount Reclassified from AOCI | Prior service benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other	0.5	0.5
Commodity contracts | Amount Reclassified from AOCI | Cash flow hedging items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ 1.4	$ 6.7