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REVENUE RECOGNITION - Contract Acquisition Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Contract Acquisition Costs |  |
Amortization of contract acquisition cost | $ 1.8 | $ 1.6
Prepayments and other current assets |  |
Contract Acquisition Costs |  |
Short-term contract acquisition costs | 1.7 | 1.4
Other assets |  |
Contract Acquisition Costs |  |
Long-term contract acquisition costs | $ 1.1 | $ 1.0

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