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Revisions in Estimates (Tables)
6 Months Ended
Jun. 30, 2024
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Change in Accounting Estimates
The projects with decreases from revisions in estimates, which individually had an impact of $5.0 million or more on gross profit, are summarized as follows (dollars in millions, except per share data):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Number of projects with downward estimate changes
Range of reduction in gross profit from each project, net$
5.3 - 10.1
$
20.7
$
5.9 - 17.8
$
5.9 - 32.1
Decrease to project profitability, net$15.5 $20.7 $30.2 $38.0 
Decrease to net income/increase to net loss$11.9 $15.8 $23.2 $29.0 
Amounts attributable to non-controlling interests$2.7 $10.4 $3.2 $16.0 
Decrease to net income/increase to net loss attributable to Granite Construction Incorporated $9.2 $5.4 $19.9 $13.0 
Decrease to net income/increase to net loss per diluted share
attributable to common shareholders
$0.17 $0.12 $0.45 $0.30