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Business Combinations - Summary of Unaudited Pro Forma Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |
Loss on foreign currency forward transactions |  | $ 29.0 |  |  |
Hermes |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenue | $ 308.6 |  | $ 317.1 | $ 923.3 | $ 951.5
Net Income | $ 59.6 |  | $ 76.5 | 179.9 | $ 229.6
Hermes | Foreign Currency Forward |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loss on foreign currency forward transactions |  |  |  | $ 29.0 |

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