Acquisitions - Summary of Consideration Transferred and Estimated Fair Value Assigned to Assets Acquired and Liabilities Assumed (Details) € in Millions, $ in Millions	Jun. 03, 2025 USD ($)	Jun. 03, 2025 EUR (€)	Aug. 31, 2025 USD ($)	May 31, 2025 USD ($)
Consideration Transferred
Contingent Capital Contribution - Cash	$ 11.3	€ 10.0
Recognized amounts of identifiable assets acquired and liabilities assumed
Goodwill			$ 101.7	$ 79.6
Sitem Group
Consideration Transferred
Cash Consideration	44.2
Contingent Consideration - Cash	4.7	€ 4.2
Subtotal	48.9
Contingent Capital Contribution - Cash	0.3
Subtotal	5.4
Business combination contribution from subsidiary	12.0
Total Consideration Transferred	66.3
Total Consideration Transferred	66.3
Recognized amounts of identifiable assets acquired and liabilities assumed
Cash and cash equivalents	42.6
Receivables	39.6
Inventories	40.4
Deferred income tax assets	3.2
Prepaid expenses	4.9
Operating lease right-of-use assets	16.5
Finance lease right-of-use assets	8.6
Property, plant and equipment	98.8
Intangible assets	24.0
Other Assets	1.0
Total identifiable assets	279.6
Accounts payable	(34.7)
Accrued compensation and related taxes	(9.3)
Current operating lease liabilities	(2.7)
Current finance lease liabilities	(2.4)
Noncurrent operating lease liabilities	(13.9)
Noncurrent finance lease liabilities	(6.2)
Current maturities of long-term debt and short-term debt	(25.9)
Deferred income tax liabilities	(16.9)
Long-term debt	(25.3)
Pension and other postretirement benefit obligations	(14.3)
Other non-current liabilities	(1.9)
Total identifiable liabilities	(153.5)
Sitem Group - Net identifiable assets	126.1
Goodwill	22.0
Total - Sitem Group	148.1
Contribution of Tempel's electrical steel subsidiary in Nagold, Germany	12.0
Redeemable noncontrolling interest - Net Put option	(10.7)
Redeemable noncontrolling interest	(71.1)
Total - redeemable noncontrolling interest	(81.8)
Cash Capital Contribution	$ 5.1