Reclassifications from Accumulated Other Comprehensive Loss - Schedule of Amounts Reclassified from AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other	$ (3.8)	$ (52.9)	$ (5.6)	$ (58.5)
Total before tax	122.0	10.1	328.2	117.7
Tax benefit	(26.6)	(3.8)	(63.9)	(24.8)
Net income	95.4	6.3	264.3	92.9
Amount Reclassified from AOCI | Cash flow hedging items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(0.7)	(4.2)	(3.9)	(7.4)
Tax benefit	0.2	1.0	0.9	1.7
Net income	(0.5)	(3.2)	(3.0)	(5.7)
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)	(52.7)	(3.9)	(54.9)
Tax benefit	0.3	12.5	1.0	13.1
Net income	(1.0)	(40.2)	(2.9)	(41.8)
Amount Reclassified from AOCI | Net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other	(0.5)	(1.3)	(1.5)	(4.3)
Amount Reclassified from AOCI | Prior service (cost) benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other	(0.8)	0.5	(2.4)	1.3
Amount Reclassified from AOCI | Pension settlement charge
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other	0.0	(51.9)	0.0	(51.9)
Commodity contracts | Amount Reclassified from AOCI | Cash flow hedging items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ (0.7)	$ (4.2)	$ (3.9)	$ (7.4)