Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)	3 Months Ended
	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