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Summary of Significant Accounting Policies - Investments in Affiliates and Other Entities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2018
Water and Gas Pipeline Infrastructure Contractor
Summary Of Significant Accounting Policies [Line Items]
Equity interest acquired		30.00%
Cash subscription price		$ 22.2
Cash dividends received from investment		$ 3.9
Electric Power Infrastructure Services Company
Summary Of Significant Accounting Policies [Line Items]
Payment to acquire equity interest and customer relationship and other intangible assets	$ 12.3
Equity interest		49.00%
Capital for Infrastructure Projects
Summary Of Significant Accounting Policies [Line Items]
Capital provided to investors		$ 80.0
Infrastructure Investors Partnership | Capital for Infrastructure Projects
Summary Of Significant Accounting Policies [Line Items]
Capital provided to investors		$ 1,000.0

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