Employee Benefit Plans (Summary of Key Information for the Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Multiemployer Plans [Line Items]
Company contributions	$ 33.8	$ 32.3	$ 41.2
The Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Fund
Multiemployer Plans [Line Items]
Pension Protections Act Zone Status	Green	Green
Company contributions	$ 4.2	$ 6.7	9.5
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	Apr. 15, 2025
Carpenters Pension Trust Fund for Northern California
Multiemployer Plans [Line Items]
Pension Protections Act Zone Status	Red	Red
FIP/RP Status Pending or Implemented	Implemented
Company contributions	$ 2.5	$ 2.4	2.9
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	Jun. 30, 2027
Excavators Union Local 731 Pension Fund
Multiemployer Plans [Line Items]
Pension Protections Act Zone Status	Green	Green
Company contributions	$ 2.4	$ 4.0	4.0
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	Apr. 30, 2026
Operating Engineers Pension Trust
Multiemployer Plans [Line Items]
Pension Protections Act Zone Status	Green	Yellow
Company contributions	$ 2.4	$ 3.4	2.4
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	Jun. 30, 2025
Construction Laborers Pension Trust for Southern California
Multiemployer Plans [Line Items]
Pension Protections Act Zone Status	Green	Green
Company contributions	$ 2.1	$ 3.4	2.8
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	Jun. 30, 2026
Joint Pension Fund, Local Union 164 IBEW
Multiemployer Plans [Line Items]
Pension Protections Act Zone Status	Green	Green
Company contributions	$ 1.4	$ 6.4	$ 6.8
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	Apr. 30, 2026