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Business Combinations - Summary of Unaudited Pro Forma Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Derivative loss | $ 29.0 |  |
Foreign Currency Forward |  |  |
Business Acquisition [Line Items] |  |  |
Derivative loss |  | $ 4.0 |
Hermes |  |  |
Business Acquisition [Line Items] |  |  |
Hermes revenue |  | 1,230.5 | $ 1,268.6
Hermes net Income |  | $ 241.4 | $ 306.1

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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