Schedule of Accumulated Other Comprehensive Income (Loss) (Details) $ in Millions	9 Months Ended
	Jun. 30, 2025 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 30, 2024	$ (180.6)
OCI before reclassifications	(24.7)
Reclassifications to earnings	(15.4)
Balance at December 31, 2022	(220.7)
Zinc contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 30, 2024	3.1
OCI before reclassifications	(1.1)
Balance at December 31, 2022	(0.6)
Zinc contracts \| Amount Reclassified from AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassifications to earnings	(2.6)
Foreign currency contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 30, 2024	(3.7)
OCI before reclassifications	(0.5)
Balance at December 31, 2022	(6.0)
Foreign currency contracts \| Amount Reclassified from AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassifications to earnings	(1.8)
Interest rate swap
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 30, 2024	30.3
OCI before reclassifications	5.3
Balance at December 31, 2022	22.7
Interest rate swap \| Amount Reclassified from AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassifications to earnings	(12.9)
Other Comprehensive Income, Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 30, 2024	(96.8)
OCI before reclassifications	(27.0)
Balance at December 31, 2022	(124.1)
Other Comprehensive Income, Foreign Currency Translation Adjustment \| Amount Reclassified from AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassifications to earnings	(0.3)
Other Comprehensive Income, Defined Benefit Plans, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 30, 2024	(113.5)
OCI before reclassifications	(1.4)
Balance at December 31, 2022	(112.7)
Other Comprehensive Income, Defined Benefit Plans, Adjustment \| Amount Reclassified from AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassifications to earnings	$ 2.2