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Revenue Recognition - Contract Acquisition Costs (Details) $ in Millions	12 Months Ended
	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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- References

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
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