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Related Party Transactions (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) agreement item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 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 | $ 2.8 | 2.8 | 2.7
O&G [Member] |  |  |
Related party transactions |  |  |
Ownership percentage in joint venture | 75.00% |  |
Related party's ownership percentage in joint venture | 25.00% |  |
Number of joint ventures | agreement | 3 |  |
O&G [Member] | Infrastructure Projects [Member] |  |  |
Related party transactions |  |  |
Number of construction projects | item | 2 |  |
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 | $ 17.6 | 8.9 | $ 9.8
Owed to related party | $ 0.5 | $ 5.2 |

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- Definition Carrying amount as of the balance sheet date of obligations due all related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(3),(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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