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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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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Related Party Transactions (Details) $ in Millions	12 Months Ended
Related Party Transactions (Details) $ in Millions	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 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	$ 3.1	3.0	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	2
Alliant [Member]
Related party transactions
Insurance expense	$ 18.4	14.7	$ 17.6
Owed to related party	$ 2.7	$ 4.1