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Summary of Significant Accounting Policies - Foreign Currency Translation (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Related Party Transaction [Line Items] |  |
Foreign exchange (losses) gains | $ (1.2) | $ 2.0
Intra-entity Transactions |  |
Related Party Transaction [Line Items] |  |
Foreign exchange (losses) gains | $ (66.3) | $ (164.1)

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