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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Investment Advisory Services (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Revenue and Services [Line Items]
Net revenues	$ 1,588.2	$ 1,954.1	$ 4,964.2	$ 5,710.2
Average assets under management	1,347,500.0	1,648,700.0	1,437,100.0	1,581,300.0
Period end assets under management	1,230,000.0		1,230,000.0		$ 1,687,800.0
U.S. mutual funds
Revenue and Services [Line Items]
Net revenues	950.2	1,239.0	3,031.0	3,606.3
Average assets under management	677,600.0	881,000.0	728,500.0	848,100.0
Period end assets under management	614,500.0		614,500.0		871,400.0
U.S. mutual funds | Equity
Revenue and Services [Line Items]
Average assets under management	405,800.0	559,800.0	441,000.0	534,000.0
Period end assets under management	365,200.0		365,200.0		553,900.0
U.S. mutual funds | Fixed income, including money market
Revenue and Services [Line Items]
Average assets under management	79,400.0	88,400.0	82,700.0	85,600.0
Period end assets under management	74,500.0		74,500.0		85,300.0
U.S. mutual funds | Multi-asset
Revenue and Services [Line Items]
Average assets under management	192,400.0	232,800.0	204,800.0	228,500.0
Period end assets under management	174,800.0		174,800.0		232,200.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products
Revenue and Services [Line Items]
Net revenues	606.4	687.9	1,838.1	2,015.2
Average assets under management	669,900.0	767,700.0	708,600.0	733,200.0
Period end assets under management	615,500.0		615,500.0		816,400.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Equity
Revenue and Services [Line Items]
Average assets under management	319,100.0	445,700.0	352,000.0	427,300.0
Period end assets under management	282,600.0		282,600.0		438,800.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Fixed income, including money market
Revenue and Services [Line Items]
Average assets under management	93,600.0	94,300.0	92,400.0	92,100.0
Period end assets under management	90,900.0		90,900.0		90,400.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Multi-asset
Revenue and Services [Line Items]
Average assets under management	214,300.0	227,700.0	221,800.0	213,800.0
Period end assets under management	199,300.0		199,300.0		245,500.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Alternatives
Revenue and Services [Line Items]
Average assets under management	42,900.0	0.0	42,400.0	0.0
Period end assets under management	42,700.0		42,700.0		$ 41,700.0
Other clients
Revenue and Services [Line Items]
Net revenues	31.6	27.2	95.1	88.7
Investment advisory fees
Revenue and Services [Line Items]
Net revenues	1,442.0	1,813.4	4,600.8	5,288.4
Investment advisory fees | U.S. mutual funds
Revenue and Services [Line Items]
Net revenues	841.7	1,125.5	2,694.4	3,273.2
Investment advisory fees | U.S. mutual funds | Equity
Revenue and Services [Line Items]
Net revenues	580.1	813.0	1,876.5	2,310.8
Investment advisory fees | U.S. mutual funds | Fixed income, including money market
Revenue and Services [Line Items]
Net revenues	66.2	64.8	198.9	183.7
Investment advisory fees | U.S. mutual funds | Multi-asset
Revenue and Services [Line Items]
Net revenues	195.4	247.7	619.0	778.7
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products
Revenue and Services [Line Items]
Net revenues	600.3	687.9	1,906.4	2,015.2
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Equity
Revenue and Services [Line Items]
Net revenues	316.9	458.8	1,047.5	1,329.0
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Fixed income, including money market
Revenue and Services [Line Items]
Net revenues	41.4	41.3	125.2	119.6
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Multi-asset
Revenue and Services [Line Items]
Net revenues	171.8	187.8	530.3	566.6
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Alternatives
Revenue and Services [Line Items]
Net revenues	70.2	0.0	203.4	0.0
Investment advisory fees | Other clients
Revenue and Services [Line Items]
Net revenues	0.0	0.0	0.0	0.0
Administrative fees
Revenue and Services [Line Items]
Net revenues	123.1	109.8	372.7	331.8
Administrative fees | U.S. mutual funds
Revenue and Services [Line Items]
Net revenues	86.5	82.6	265.1	243.1
Administrative fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products
Revenue and Services [Line Items]
Net revenues	5.0	0.0	12.5	0.0
Administrative fees | Other clients
Revenue and Services [Line Items]
Net revenues	31.6	27.2	95.1	88.7
Distribution and servicing fees
Revenue and Services [Line Items]
Net revenues	22.0	30.9	71.5	90.0
Distribution and servicing fees | U.S. mutual funds
Revenue and Services [Line Items]
Net revenues	22.0	30.9	71.5	90.0
Distribution and servicing fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products
Revenue and Services [Line Items]
Net revenues	0.0	0.0	0.0	0.0
Distribution and servicing fees | Other clients
Revenue and Services [Line Items]
Net revenues	0.0	0.0	0.0	0.0
Capital allocation-based income
Revenue and Services [Line Items]
Net revenues	1.1	$ 0.0	(80.8)	$ 0.0
Capital allocation-based income | U.S. mutual funds
Revenue and Services [Line Items]
Net revenues	0.0		0.0
Capital allocation-based income | Subadvised funds, separate accounts, collective investment trusts, and other investment products
Revenue and Services [Line Items]
Net revenues	1.1		(80.8)
Capital allocation-based income | Other clients
Revenue and Services [Line Items]
Net revenues	$ 0.0		$ 0.0

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