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Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract] |  |  |  |
Interest paid | $ 35.9 | $ 17.7 |  |
Non-cash investing and financing activities (included in Accounts payable): |  |  |  |
Unpaid purchases of property and equipment | 10.1 | 3.5 |  |
Supplemental lease disclosures: |  |  |  |
Operating lease liabilities arising from obtaining operating lease assets | 24.3 | 4.9 |  |
Cash paid for amounts included in the measurement of operating lease liabilities | 5.7 | 3.4 |  |
Finance lease liabilities arising from obtaining finance lease assets | 2.1 | 2.2 |  |
Components of cash, cash equivalents and restricted cash: |  |  |  |
Cash and cash equivalents | 295.7 | 750.1 | $ 780.3 |
Restricted cash included in Other assets | 13.8 | 14.0 |  |
Total cash, cash equivalents and restricted cash presented on our Statements of Consolidated Cash Flows | $ 309.5 | $ 764.1 | $ 794.3 | $ 278.6

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