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Discontinued Operations - Additional Information (Detail) - M&I Electric US Operations - Discontinued Operations, Disposed of by Sale - USD ($) $ in Millions		1 Months Ended	6 Months Ended
	Aug. 12, 2018	Oct. 31, 2018	Jun. 30, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total purchase price	$ 18.5
Cash consideration	10.1
Assumed indebtedness	$ 8.4
Decrease in net working capital		$ (4.3)
Cash provided by operating activities of discontinued operations			$ 0.4
Cash used in investing activities of discontinued operations			$ 0.2

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Amount of cash inflow (outflow) of investing activities of discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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