Revisions in Estimates (Tables)

9 Months Ended

Sep. 30, 2023

Quarterly Financial Information Disclosure [Abstract]

Schedule of Change in Accounting Estimates

The projects with increases 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 September 30,				Nine Months Ended September 30,
				As Restated				As Restated
		2023		2022		2023		2022
Number of projects with upward estimate changes		1		1		1		—
Increase to project profitability, net	$	8.6	$	6.6	$	8.1	$	—
Increase to net income/decrease to net loss	$	6.5	$	5.1	$	6.1	$	—
Amounts attributable to non-controlling interests	$	—	$	—	$	3.3	$	—
Increase to net income/decrease to net loss attributable to Granite Construction Incorporated	$	6.5	$	5.1	$	2.8	$	—
Increase to net income/decrease to net loss per diluted share attributable to common shareholders	$	0.12	$	0.10	$	0.06	$	—

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 September 30,				Nine Months Ended September 30,
								As Restated
		2023		2022		2023		2022
Number of projects with downward estimate changes		1		1		3		6
Range of reduction in gross profit from each project, net	$	8.4	$	15.2	$	5.3 - 40.5	$	5.7 - 21.2
Decrease to project profitability, net	$	8.4	$	15.2	$	51.1	$	64.6
Decrease to net income/increase to net loss	$	6.3	$	11.7	$	38.3	$	49.8
Amounts attributable to non-controlling interests	$	4.2	$	7.6	$	20.2	$	13.2
Decrease to net income/increase to net loss attributable to Granite Construction Incorporated	$	2.1	$	4.1	$	18.1	$	36.6
Decrease to net income/increase to net loss per diluted share attributable to common shareholders	$	0.04	$	0.08	$	0.41	$	0.70