Leases - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Lessee, Lease, Description
Operating lease, liability, including sublease receivables	$ 739,800,000		$ 739,800,000		$ 723,900,000
Operating lease, liability	728,955,000		728,955,000		712,849,000
Operating lease, liability, portion ring-fenced by special purpose vehicles	36,600,000		36,600,000		36,500,000
Operating lease, future contracted revenues and sublease income			176,200,000		$ 183,700,000
Operating lease costs	34,300,000	$ 31,300,000	68,400,000	$ 56,700,000
Operating lease payments			61,400,000	52,900,000
Short-term lease expense	200,000	300,000	300,000	100,000
Sublease income	800,000	200,000	1,500,000	200,000
Lease impairment	$ 0	0	$ 0	0
Weighted average discount rate	4.73%		4.73%		4.61%
Weighted average lease term	6 years 9 months 18 days		6 years 9 months 18 days		7 years
Right-of-use assets	$ 640,125,000		$ 640,125,000		$ 638,592,000
Right-of-use liabilities	$ 101,426,000		$ 101,426,000		$ 96,860,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accounts payable, accrued expenses and other liabilities (see Note 27)		Accounts payable, accrued expenses and other liabilities (see Note 27)		Accounts payable, accrued expenses and other liabilities (see Note 27)
Right-of-use liabilities, non-current	$ 638,340,000		$ 638,340,000		$ 627,088,000
Rent expense	41,000,000	$ 35,400,000	80,500,000	$ 72,100,000
Management services, servicing fees and other
Lessee, Lease, Description
Operating lease, liability	$ 196,600,000		$ 196,600,000		$ 188,000,000
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