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v3.20.2

Statement of Cash Flows - Summary of Non-cash Investing and Financing Activities (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Cash and Cash Equivalents [Abstract] |  |  |  |
Accrued capital expenditures | $ 100.4 | $ 100.5 | $ 133.7 | $ 54.5

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