Reclassifications from Accumulated Other Comprehensive Loss - Schedule of Amounts Reclassified from AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other	$ 0.0	$ 0.1	$ 0.1	$ (0.1)
Total before tax	55.2	7.7	107.6	(0.1)
Tax benefit (expense)	(12.5)	(1.5)	(21.0)	(0.5)
Net income	42.7	6.2	86.6	(0.6)
Amount Reclassified from AOCI | Cash flow hedging items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(1.8)	1.2	(3.2)	7.9
Tax benefit (expense)	0.4	(0.3)	0.7	(1.9)
Net income	(1.4)	0.9	(2.5)	6.0
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)	(2.2)	(2.9)
Tax benefit (expense)	0.3	0.4	0.6	0.8
Net income	(0.8)	(1.1)	(1.6)	(2.1)
Amount Reclassified from AOCI | Net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other	(1.6)	(2.0)	(3.2)	(4.0)
Amount Reclassified from AOCI | Prior service benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other	0.5	0.5	1.0	1.1
Commodity contracts | Amount Reclassified from AOCI | Cash flow hedging items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ (1.8)	$ 1.2	$ (3.2)	$ 7.9