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Accounts Payable and Accrued Liabilities
 12 Months Ended
Dec. 31, 2024
Accounts Payable and Accrued Liabilities [Abstract]  
Accounts Payable and Accrued Liabilities [Text Block] ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
Components of accounts payable and accrued liabilities follow (in millions):
December 31,
20242023
Trade payables$5.8 $6.1 
Compensation and employee benefits19.9 21.1 
Postretirement health and life benefit obligations - current9.5 10.1 
Accrued interest on 2.25% Convertible Notes
1.3 — 
Operating lease liability1.4 1.4 
Other accrued liabilities0.9 3.2 
   Total accounts payable and accrued liabilities$38.8 $41.9