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Revenue by Geographic Area (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Revenue | $ 193.0 | $ 218.4
United States |  |
Revenue | 141.3 | 134.5
Belgium |  |
Revenue | 35.2 | 34.9
Japan |  |
Revenue | 3.1 | 49.0
Other Foreign |  |
Revenue | 13.4 |
Total foreign |  |
Revenue | $ 51.7 | $ 83.9

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