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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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