Derivative and Hedging Activities - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative [Line Items]
Derivatives reclassified from other comprehensive income				$ 10,400,000
Derivative liability, including accrued interest		$ 20,000,000		20,000,000		$ 38,900,000
Derivative asset, including accrued interest		0		0		0
Derivative instrument termination value		20,600,000		20,600,000		$ 40,200,000
Treasury Lock | Cash Flow Hedging | Derivatives Designated as Hedging Instruments
Derivative [Line Items]
Treasury lock agreement	$ 330,000,000
Loss on change in fair value	$ 4,800,000
Interest Rate Swaps
Derivative [Line Items]
Loss on change in fair value		$ 2,700,000	$ 2,400,000	$ 7,600,000	$ 4,200,000