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The expense in the period incurred with respect to protection provided by insurance entities against risks other than risks associated with production (which are allocated to cost of sales).

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Related Party Transactions (Details) $ in Millions	12 Months Ended
Related Party Transactions (Details) $ in Millions	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