Commitments, Contingencies and Guarantees - Commitments (Details) $ in Millions	3 Months Ended
	Feb. 28, 2023 USD ($)
Commitments and Guarantees Obligations [Line Items]
2023	$ 11,673.4
2024	538.0
2025  and  2026	406.2
2027  and  2028	12.8
2029  and  Later	155.3
Maximum Payout	$ 12,785.7
Repurchase obligation settlement period	3 days
Equity commitments
Commitments and Guarantees Obligations [Line Items]
2023	$ 9.4
2024	16.8
2025  and  2026	84.2
2027  and  2028	2.7
2029  and  Later	155.3
Maximum Payout	268.4
Loan commitments
Commitments and Guarantees Obligations [Line Items]
2023	2.5
2024	250.0
2025  and  2026	70.0
2027  and  2028	10.1
2029  and  Later	0.0
Maximum Payout	332.6
Loan Purchase Commitments
Commitments and Guarantees Obligations [Line Items]
2023	2,290.1
2024	0.0
2025  and  2026	0.0
2027  and  2028	0.0
2029  and  Later	0.0
Maximum Payout	2,290.1
Underwriting commitments
Commitments and Guarantees Obligations [Line Items]
2023	71.3
2024	0.0
2025  and  2026	0.0
2027  and  2028	0.0
2029  and  Later	0.0
Maximum Payout	71.3
Forward starting reverse repos
Commitments and Guarantees Obligations [Line Items]
2023	5,636.5
2024	0.0
2025  and  2026	0.0
2027  and  2028	0.0
2029  and  Later	0.0
Maximum Payout	5,636.5
Forward starting repos
Commitments and Guarantees Obligations [Line Items]
2023	3,606.4
2024	0.0
2025  and  2026	0.0
2027  and  2028	0.0
2029  and  Later	0.0
Maximum Payout	3,606.4
Other unfunded commitments
Commitments and Guarantees Obligations [Line Items]
2023	57.2
2024	271.2
2025  and  2026	252.0
2027  and  2028	0.0
2029  and  Later	0.0
Maximum Payout	580.4
Back-To-Back Committed Sales Contracts
Commitments and Guarantees Obligations [Line Items]
Maximum Payout	$ 2,450.0