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Business Combinations - Additional Information (Details) £ in Millions, $ in Millions | May 01, 2019 USD ($) | Mar. 23, 2018 USD ($) | Mar. 23, 2018 GBP (£) | Oct. 13, 2017 USD ($)
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P2P Mailing Limited [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition price |  | $ 135 | £ 92 |
FC (Flying Cargo) Express Ltd. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition price | $ 67 |  |  |
Northwest Research, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition price |  |  |  | $ 50

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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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