Reportable Segments - Segment Income (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information
Sales to external customers	$ 289.3	$ 244.1
Depreciation and amortization expense	16.0	12.7
Operating (loss) income	4.6	14.8
Payments to Acquire Productive Assets	5.9	6.2
Restructuring costs	7.4	0.9
Acquisition related costs	0.9	1.3
VRV
Segment Reporting Information
Sales of acquiree	22.1
Operating loss of acquiree	(8.1)
Operating Segments \| Energy & Chemicals
Segment Reporting Information
Sales to external customers	105.6	89.9
Depreciation and amortization expense	8.6	6.6
Operating (loss) income	(1.3)	2.8
Payments to Acquire Productive Assets	3.2	2.0
Restructuring costs	4.5	0.2
Operating Segments \| Energy & Chemicals \| VRV
Segment Reporting Information
Sales of acquiree	8.6
Operating loss of acquiree	(2.8)
Operating Segments \| D&S West
Segment Reporting Information
Sales to external customers	118.0	100.6
Depreciation and amortization expense	2.9	2.9
Operating (loss) income	25.6	22.2
Payments to Acquire Productive Assets	1.2	1.1
Restructuring costs	0.3	0.0
Operating Segments \| D&S East
Segment Reporting Information
Sales to external customers	68.7	55.1
Depreciation and amortization expense	4.2	2.9
Operating (loss) income	(2.3)	3.7
Payments to Acquire Productive Assets	1.0	1.9
Restructuring costs	2.4	0.2
Operating Segments \| D&S East \| VRV
Segment Reporting Information
Sales of acquiree	13.5
Operating loss of acquiree	(5.3)
Intersegment Eliminations
Segment Reporting Information
Sales to external customers	(3.0)	(1.5)
Depreciation and amortization expense	0.0	0.0
Operating (loss) income	(1.1)	(0.4)
Payments to Acquire Productive Assets	0.0	0.0
Corporate
Segment Reporting Information
Sales to external customers	0.0	0.0
Depreciation and amortization expense	0.3	0.3
Operating (loss) income	(16.3)	(13.5)
Payments to Acquire Productive Assets	0.5	1.2
Restructuring costs	0.2	$ 0.5
Fair Value Adjustment to Inventory \| VRV
Segment Reporting Information
Operating loss of acquiree	$ 1.7

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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