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Organization and Basis of Presentation (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Mar. 07, 2025
USD ($)
Nov. 30, 2023
shares
Dec. 31, 2025
USD ($)
state
reportable_segment
$ / shares
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
May 31, 2023
$ / shares
Organization [Line Items]            
Number of states in which entity operates | state     14      
Number of reportable segments | reportable_segment     4      
Separation transaction, percent of outstanding shares distributed           90.00%
Common stock, par value (in dollars per share) | $ / shares     $ 0.01 $ 0.01   $ 0.01
Separation transaction, outstanding shares distributed (in shares) | shares   5,656,621        
Separation transaction, distribution ratio           0.25
Reclassification, Other            
Organization [Line Items]            
Contract asset     $ 31.8      
Contract liability     (11.0)      
Related Party            
Organization [Line Items]            
Costs and expenses, related party     0.0 $ 0.0 $ 10.7  
Related Party | Selling, General and Administrative Expenses            
Organization [Line Items]            
Costs and expenses, related party         $ 10.7  
Knife River            
Organization [Line Items]            
Subsidiary, ownership percentage, noncontrolling owner           10.00%
Trade Accounts Receivable | Reclassification, Other            
Organization [Line Items]            
Retention receivables     $ 42.8      
Strata Corporation            
Organization [Line Items]            
Business combination, consideration transferred $ 454.0