Reclassifications from Accumulated Other Comprehensive Loss - Schedule of Amounts Reclassified from AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net	$ 13.0	$ 10.1	$ 25.6	$ 20.3
(Loss) gain	(1.9)	6.6	(5.4)	10.7
Total before tax	7.7	(35.0)	(0.1)	(60.2)
Tax (expense)/benefit	(1.5)	5.6	(0.5)	16.1
Net income	6.2	(29.4)	(0.6)	(44.1)
Amount Reclassified from AOCI | Cash flow hedging items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	1.2	(0.9)	7.9	(2.7)
Tax (expense)/benefit	(0.3)	0.2	(1.9)	0.6
Net income	0.9	(0.7)	6.0	(2.1)
Amount Reclassified from AOCI | Pension and other postretirement benefit plan items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(1.5)	(1.5)	(2.9)	(3.0)
Tax (expense)/benefit	0.4	0.4	0.8	0.8
Net income	(1.1)	(1.1)	(2.1)	(2.2)
Amount Reclassified from AOCI | Net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Loss) gain	(2.0)	(1.9)	(4.0)	(3.8)
Amount Reclassified from AOCI | Prior service benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Loss) gain	0.5	0.4	1.1	0.8
Commodity contracts | Amount Reclassified from AOCI | Cash flow hedging items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	1.2	(1.0)	7.9	(2.9)
Forward interest rate swaps | Amount Reclassified from AOCI | Cash flow hedging items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net	$ 0.0	$ 0.1	$ 0.0	$ 0.2