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Summary of Significant Accounting Policies - Foreign Currency Translation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Related Party Transaction [Line Items] |  |  |  |
Foreign currency gains (losses) | $ (0.6) | $ (2.4) | $ (1.7) | $ (0.5)
Foreign currency gains on long-term intra-entity transactions |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Foreign currency gains (losses) | $ 92.2 | $ 21.4 | $ 25.8 | $ 185.5

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