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Business Combinations - Hudson Narratives (Details) - USD ($) $ in Millions			3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 20, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition
Payment for acquisition of businesses, net of cash acquired					$ 12.5	$ 446.0
Borrowings on revolving credit facilities					188.3	302.2
Operating income			$ 31.5	$ 7.2	65.8	17.6
Amortization expense			5.0	2.6	15.7	7.0
Acquisition related costs			2.0	7.4	4.1	8.6
Energy & Chemicals
Business Acquisition
Operating income			12.1	0.3	20.8	(2.4)
Hudson
Business Acquisition
Payment for acquisition of businesses, net of cash acquired		$ 419.5
Borrowings on revolving credit facilities		$ 300.0
Net sales	$ 6.1
Operating income	1.2
Amortization expense	$ 0.4		3.0		9.0
Acquisition related costs				7.3		8.1
Hudson | Minimum
Business Acquisition
Finite lived intangible assets useful life		2 years
Hudson | Maximum
Business Acquisition
Finite lived intangible assets useful life		15 years
Hudson | Energy & Chemicals
Business Acquisition
Net sales			44.1	6.1	134.9	6.1
Operating income			$ 4.3	$ 1.2	$ 14.6	$ 1.2

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