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Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2020
Accounting Policies [Abstract] |
Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash for Balance Sheets and Cash Flows | The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Company’s condensed consolidated balance sheets that sum to the total of the same such amounts shown in the Company’s condensed consolidated statements of cash flows:
|  | June 30, 2020 |  |  | December 31, 2019 |
|  | (in millions) |
Cash and cash equivalents |  | $ | 1,740.0 |  |  | $ | 839.4 |
Restricted cash included in Prepaid expenses and other current assets |  |  | 2.5 |  |  |  | 2.5 |
Restricted cash included in Other assets |  |  | 5.6 |  |  |  | 5.6 |
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows |  | $ | 1,748.1 |  |  | $ | 847.5 |

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