Employee Benefit Plans (Summary of Key Information for the Plans) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Multiemployer Plans [Line Items]
Company Contributions	$ 43.6	$ 44.3	$ 35.7
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	$ 9.5	$ 10.1	9.3
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	Apr. 13, 2022
Joint Pension Fund, Local Union 164 IBEW
Multiemployer Plans [Line Items]
Pension Protections Act Zone Status	Green	Yellow
FIP/RP Status Pending or Implemented	Implemented
Company Contributions	$ 6.8	$ 2.5	0.8
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	Jun. 02, 2025
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	$ 4.0	$ 4.8	5.1
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	Apr. 30, 2026
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	$ 2.9	$ 4.6	4.0
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	$ 2.8	$ 3.5	$ 3.0
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	May 31, 2022

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- Definition

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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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