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Derivatives (Details) - Foreign Currency Forward £ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 GBP (£) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 GBP (£)
Derivative [Line Items] |  |  |  |  |
Notional amount | £ |  |  | £ 46.0 |  | £ 46.0
Loss on derivative instruments | $ 2.8 | $ 1.5 |  |  |
Other Current Liabilities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability | $ 2.3 | $ 2.3 |  | $ 3.8 |

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