Commitments and Contingencies (Details) - USD ($) $ in Millions						1 Months Ended				3 Months Ended	12 Months Ended
	Oct. 18, 2022	Jan. 27, 2020	Dec. 13, 2019	Jun. 04, 2019	Feb. 26, 2015	Mar. 31, 2018	Mar. 31, 2016	Jun. 30, 2015	Aug. 31, 2013	Dec. 31, 2019	Dec. 31, 2023	Jul. 02, 2018
Alaskan Way Viaduct Matter
Contingencies and Commitments
Value of claim filed							$ 57.2	$ 532.0
Settlement on judgment, awarded to other party			$ 57.2
Pre-tax charge, impact from jury verdict										$ 166.8
Pre-tax accrual, impact from jury verdict										25.7
Settlement on judgment										$ 57.2
Loss contingency, damages paid, value	$ 34.6
Alaskan Way Viaduct Matter | Seattle Tunnel Partners
Contingencies and Commitments
Ownership percentage in joint venture											45.00%
Seattle Tunnel Partners
Contingencies and Commitments
Value of counterclaim filed in excess of											$ 640.0
George Washington Bridge Bus Station Matter
Contingencies and Commitments
Value of claim filed		$ 113.0			$ 30.0
Value of project									$ 100.0
Court issued writ of attachment amount				$ 23.0
Proof of claim amount			$ 113.0
Value of damages seeking												$ 113.0
George Washington Bridge Bus Station Matter | Return of Retainage by Developer
Contingencies and Commitments
Value of counterclaim filed in excess of						$ 29.0
George Washington Bridge Bus Station Matter | Tutor Perini Building Corp
Contingencies and Commitments
Value of counterclaim filed in excess of						113.0
George Washington Bridge Bus Station Matter | George Washington Bridge Bus Station Development Venture, LLC
Contingencies and Commitments
Value of claim filed						4.8
Value of counterclaim filed in excess of						$ 29.0