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Description of the Business and Summary of Significant Accounting Policies - Non-trade Receivables (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Non-trade receivables | $ 46.2 | $ 5.2
Tenant improvement allowance receivable related to the new corporate headquarters included in prepaid expenses and other current assets and other assets | $ 40.5 |

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- Definition Tenant Improvement Allowance Receivable + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The sum of amounts currently receivable other than from customers. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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