Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Lessee, Lease, Description
Operating lease, liability, including sublease receivables	$ 635,800		$ 635,800		$ 705,100
Operating lease, liability	622,553		622,553		694,916
Operating lease, liability, portion ring-fenced by special purpose vehicles	36,600		36,600		36,600
Operating lease, future contracted revenues and sublease income			194,200		$ 179,300
Operating lease costs	32,000	$ 34,300	65,500	$ 68,400
Operating lease payments			65,500	61,400
Short-term lease expense	0	200	400	300
Sublease income	$ 900	800	$ 1,500	1,500
Weighted average discount rate	4.95%		4.95%		4.87%
Weighted average lease term	6 years		6 years		6 years 6 months
Right-of-use assets	$ 531,442		$ 531,442		$ 596,362
Right-of-use liabilities	$ 107,331		$ 107,331		$ 107,084
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accounts payable, accrued expenses and other liabilities (see Note 26)		Accounts payable, accrued expenses and other liabilities (see Note 26)		Accounts payable, accrued expenses and other liabilities (see Note 26)
Right-of-use liabilities, non-current	$ 528,424		$ 528,424		$ 598,044
Rent expense	41,300	$ 41,000	83,000	$ 80,500
Management services, servicing fees and other
Lessee, Lease, Description
Operating lease, liability	$ 152,100		$ 152,100		$ 172,700
Minimum
Lessee, Lease, Description
Remaining lease terms	1 year		1 year
Options to extend leases	1 year		1 year
Maximum
Lessee, Lease, Description
Remaining lease terms	11 years		11 years
Options to extend leases	10 years		10 years