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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 |  |

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