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Business Combinations - Hudson Narratives (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
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Sep. 20, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Business Acquisition |  |  |  |  |
Payment for acquisition of businesses, net of cash acquired |  |  |  | $ 12.5 | $ 23.2
Borrowings on revolving credit facilities |  |  |  | 65.0 | 2.2
Sales |  | $ 319.9 | $ 238.2 | 599.6 | 442.3
Operating income |  | 23.5 | 9.9 | 40.4 | 10.2
Amortization expense |  | 5.7 | $ 3.1 | 11.8 | $ 6.1
Hudson |  |  |  |  |
Business Acquisition |  |  |  |  |
Payment for acquisition of businesses, net of cash acquired | $ 419.5 |  |  |  |
Borrowings on revolving credit facilities | $ 300.0 |  |  |  |
Sales |  | 47.5 |  | 90.8 |
Operating income |  | 6.1 |  | 10.3 |
Amortization expense |  | $ 3.0 |  | $ 6.0 |
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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