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Related Party Transactions (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) project | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Related party transactions |  |  |
Expenses incurred with related party | $ 3.2 | $ 3.2 | $ 3.2
Chairman and Chief Executive Officer |  |  |
Related party transactions |  |  |
Related party, payment for leases | $ 3.2 | 3.1 | 3.0
O&G |  |  |
Related party transactions |  |  |
Ownership percentage in joint venture | 75.00% |  |
Related party ownership percentage in joint venture | 25.00% |  |
O&G | Project In Los Angeles, California |  |  |
Related party transactions |  |  |
Number of construction projects | project | 2 |  |
Alliant |  |  |
Related party transactions |  |  |
Insurance expense | $ 16.0 | 18.4 | $ 14.7
Owed to related party | $ 2.7 | $ 2.7 |

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