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Business Combinations - Hudson Narratives (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Sep. 20, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Business Acquisition |  |  |
Payment for acquisition of businesses, net of cash acquired |  | $ 12.5 | $ 23.2
Borrowings on revolving credit facilities |  | 38.0 | 2.2
Sales |  | 279.7 | 204.1
Operating income |  | 16.9 | 0.3
Amortization expense |  | 6.1 | $ 3.0
Hudson |  |  |
Business Acquisition |  |  |
Payment for acquisition of businesses, net of cash acquired | $ 419.5 |  |
Borrowings on revolving credit facilities | $ 300.0 |  |
Sales |  | 43.3 |
Operating income |  | 4.2 |
Amortization expense |  | $ 3.0 |
Hudson | Minimum |  |  |
Business Acquisition |  |  |
Finite lived intangible assets useful life | 2 years |  |
Hudson | Maximum |  |  |
Business Acquisition |  |  |
Finite lived intangible assets useful life | 15 years |  |

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