Revisions in Estimates (Tables)

6 Months Ended

Jun. 30, 2023

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,
				As Restated
		2023		2022		2023		2022
Number of projects with downward estimate changes		1		3		2		5
Range of reduction in gross profit from each project, net	$	20.7	$	5.9 - 7.6	$	5.9 - 32.1	$	5.6 - 10.6
Decrease to project profitability, net	$	20.7	$	19.5	$	38.0	$	35.6
Decrease to net income/increase to net loss	$	15.8	$	14.9	$	29.0	$	27.3
Amounts attributable to non-controlling interests	$	10.4	$	3.0	$	16.0	$	3.0
Decrease to net income/increase to net loss attributable to Granite Construction Incorporated	$	5.4	$	11.9	$	13.0	$	24.2
Decrease to net income/increase to net loss per diluted share attributable to common shareholders	$	0.12	$	0.23	$	0.30	$	0.54