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Related Party Transactions (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Related party transactions |  |  |
Expenses incurred with related party | $ 3.2 | $ 3.2 | $ 3.2
Chairman and Chief Executive Officer |  |  |
Related party transactions |  |  |
Lease payment to related party | $ 3.0 | 2.8 | 2.8
O&G [Member] |  |  |
Related party transactions |  |  |
Ownership percentage in joint venture | 75.00% |  |
Related party's ownership percentage in joint venture | 25.00% |  |
O&G [Member] | Project In Los Angeles, California [Member] |  |  |
Related party transactions |  |  |
Number of construction projects | item | 1 |  |
Alliant [Member] |  |  |
Related party transactions |  |  |
Insurance expense | $ 14.7 | 17.6 | $ 8.9
Owed to related party | $ 4.1 | $ 0.5 |

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