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

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