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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) | 3 Months Ended |
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Sep. 30, 2021 | Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Finance Lease, Right-of-Use Asset, after Accumulated Amortization | $ 84,267,000 | $ 60,121,000
Intangible assets | 77,500,000 | 64,300,000
Right-of-use asset | 313,425,000 | $ 330,322,000
Other Payments to Acquire Businesses | 964.9 |
Pending acquisition [Domain] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other Payments to Acquire Businesses | 86.2 |
Pending acquisition [Domain] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other Payments to Acquire Businesses | 67 |
Pending acquisition [Domain] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other Payments to Acquire Businesses | 271.5 |
Pending acquisition [Domain] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other Payments to Acquire Businesses | 576.1 |
Pending acquisition [Domain] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other Payments to Acquire Businesses | $ 136.5 |

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