Reclassifications from Accumulated Other Comprehensive Loss - Schedule of Amounts Reclassified from AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other	$ (1.6)	$ (1.6)	$ (1.6)	$ (5.5)
Total before tax	105.1	55.2	206.3	107.6
Tax benefit	(21.0)	(12.5)	(37.4)	(21.0)
Net income	84.1	42.7	168.9	86.6
Amount Reclassified from AOCI | Cash flow hedging items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(1.4)	(1.8)	(3.2)	(3.2)
Tax benefit	0.3	0.4	0.8	0.7
Net income	(1.1)	(1.4)	(2.4)	(2.5)
Amount Reclassified from AOCI | Pension and other postretirement benefit plan items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(1.3)	(1.1)	(2.6)	(2.2)
Tax benefit	0.4	0.3	0.7	0.6
Net income	(0.9)	(0.8)	(1.9)	(1.6)
Amount Reclassified from AOCI | Net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other	(0.5)	(1.6)	(1.0)	(3.2)
Amount Reclassified from AOCI | Prior service (cost) benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other	(0.8)	0.5	(1.6)	1.0
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)	$ (1.8)	$ (3.2)	$ (3.2)