| 2. SUPPLEMENTAL BALANCE SHEET INFORMATION Inventories 
Inventories are comprised of the following:  
        
         |  |  |  |  |  |  |  |  |  |  
         |   |   | March 31,2025
 |   |   | December 31,2024
 |   |  
         | Raw materials and supplies |   | $ | 15.0 |   |   | $ | 16.2 |   |  
         | Work in process |   |   | 20.2 |   |   |   | 19.7 |   |  
         | Finished products and parts |   |   | 164.9 |   |   |   | 165.2 |   |  
         | Total |   | $ | 200.1 |   |   | $ | 201.1 |   |      Accrued Expenses 
Accrued expenses are comprised of the following: 
        
         |  |  |  |  |  |  |  |  |  |  
         |   |   | March 31,2025
 |   |   | December 31,2024
 |   |  
         | Employee compensation and benefits |   | $ | 35.6 |   |   | $ | 22.9 |   |  
         | Sales, use, and property taxes |   |   | 14.7 |   |   |   | 21.0 |   |  
         | Insurance |   |   | 13.9 |   |   |   | 13.2 |   |  
         | Interest |   |   | 6.2 |   |   |   | 6.1 |   |  
         | Income taxes |   |   | 2.2 |   |   |   | 1.9 |   |  
         | Other |   |   | 2.4 |   |   |   | 2.1 |   |  
         | Total accrued expenses |   | $ | 75.0 |   |   | $ | 67.2 |   |    Other Current Liabilities 
Other current liabilities are comprised of the following: 
        
         |  |  |  |  |  |  |  |  |  |  
         |   |   | March 31,2025
 |   |   | December 31,2024
 |   |  
         | Acquired unfavorable contracts |   | $ | 1.9 |   |   | $ | 7.6 |   |  
         | Accrued supply commitment charges |   |   | 12.6 |   |   |   | 12.6 |   |  
         | Munger make-whole liability |   |   | — |   |   |   | 8.6 |   |  
         | Accrued legal contingencies |   |   | 5.5 |   |   |   | 7.1 |   |  
         | Deferred revenue |   |   | 3.4 |   |   |   | 7.4 |   |  
         | Tax receivable agreement obligation |   |   | 3.3 |   |   |   | 3.3 |   |  
         | Other |   |   | 9.6 |   |   |   | 10.0 |   |  
         | Total other current liabilities |   | $ | 36.3 |   |   | $ | 56.6 |   |  |