Commitments, Contingencies and Guarantees - Commitments and Contingencies (Details) $ in Millions	12 Months Ended
	Nov. 30, 2024 USD ($)
Commitments And Guarantee Obligations [Line Items]
2025	$ 10,150.2
2026	834.1
2027 and 2028	291.9
2029 and 2030	14.3
2031 and Later	249.0
Maximum Payout	$ 11,539.5
Repurchase obligation settlement period	3 days
Equity commitments
Commitments And Guarantee Obligations [Line Items]
2025	$ 40.1
2026	2.5
2027 and 2028	32.4
2029 and 2030	0.1
2031 and Later	243.8
Maximum Payout	318.9
Loan commitments
Commitments And Guarantee Obligations [Line Items]
2025	254.4
2026	80.0
2027 and 2028	8.4
2029 and 2030	0.0
2031 and Later	5.2
Maximum Payout	348.0
Loan purchase commitments
Commitments And Guarantee Obligations [Line Items]
2025	3,661.2
2026	0.0
2027 and 2028	0.0
2029 and 2030	0.0
2031 and Later	0.0
Maximum Payout	3,661.2
Forward starting reverse repos
Commitments And Guarantee Obligations [Line Items]
2025	3,656.9
2026	0.0
2027 and 2028	0.0
2029 and 2030	0.0
2031 and Later	0.0
Maximum Payout	3,656.9
Forward starting repos
Commitments And Guarantee Obligations [Line Items]
2025	2,042.3
2026	0.0
2027 and 2028	0.0
2029 and 2030	0.0
2031 and Later	0.0
Maximum Payout	2,042.3
Other unfunded commitments
Commitments And Guarantee Obligations [Line Items]
2025	495.3
2026	751.6
2027 and 2028	251.1
2029 and 2030	14.2
2031 and Later	0.0
Maximum Payout	1,512.2
Back-to-back committed sales contracts
Commitments And Guarantee Obligations [Line Items]
Maximum Payout	$ 3,510.0