Employee Benefit Plans (Summary of Key Information for the Plans) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Multiemployer Plans [Line Items]
Company Contributions	$ 46.8	$ 36.5	$ 36.6
The Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Fund
Multiemployer Plans [Line Items]
Pension Protections Act Zone Status	Green	Green
FIP/RP Status Pending Or Implemented	NA
Company Contributions	$ 10.1	$ 9.3	12.2
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	Apr. 13, 2022
Excavators Union Local 731 Pension Fund
Multiemployer Plans [Line Items]
Pension Protections Act Zone Status	Green	Green
FIP/RP Status Pending Or Implemented	NA
Company Contributions	$ 4.8	$ 5.1	4.1
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	Apr. 30, 2022
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	$ 4.6	$ 4.0	4.9
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	Jun. 30, 2023
Northern California Electrical Workers Pension Plan
Multiemployer Plans [Line Items]
Pension Protections Act Zone Status	Green	Green
FIP/RP Status Pending Or Implemented	NA
Company Contributions	$ 3.5	$ 3.0	$ 4.1
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	May 31, 2022
Laborers Pension Trust Fund For Northern California
Multiemployer Plans [Line Items]
FIP/RP Status Pending Or Implemented	NA
Steamfitters Industry Pension Fund
Multiemployer Plans [Line Items]
FIP/RP Status Pending Or Implemented	NA

Indicates certified zone status of multiemployer pension plan determined to be individually significant. Acceptable values are "Green", "Yellow", "Orange", "Red", "Other", and "NA".

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- Definition

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- Definition

Amount of cost for employer contribution to multiemployer pension plan determined to be individually significant.

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- Definition

Indicates whether funding improvement plan or rehabilitation plan was implemented or pending for multiemployer pension plan, determined to be individually significant. Acceptable values are "No", "Pending", "Implemented", "Other", and "NA".

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Indicates whether employer paid surcharge to multiemployer pension plan determined to be individually significant. Acceptable values are "No", "Yes" and "NA".

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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