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Summary of Significant Accounting Policies and Procedures and Recent Accounting Pronouncements - Revenue Recognition and Accounts Receivable (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue Recognition and Accounts Receivable |  |  |
Other revenue | $ 6.3 | $ 3.5 | $ 2.7

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- Definition Amount of revenue and income classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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- References No definition available. + Details
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