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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Investment Advisory Services (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Revenue and Services [Line Items]
Net revenues	$ 1,513.0	$ 1,929.3	$ 3,376.0	$ 3,756.1
Average assets under management	1,407,100.0	1,585,300.0	1,483,000.0	1,547,100.0
Period end assets under management	1,309,700.0		1,309,700.0		$ 1,687,800.0
U.S. mutual funds
Revenue and Services [Line Items]
Net revenues	984.9	1,209.3	2,080.8	2,367.3
Average assets under management	711,100.0	848,200.0	754,300.0	831,300.0
Period end assets under management	657,100.0		657,100.0		871,400.0
U.S. mutual funds | Equity
Revenue and Services [Line Items]
Average assets under management	426,700.0	532,200.0	458,800.0	520,900.0
Period end assets under management	390,900.0		390,900.0		553,900.0
U.S. mutual funds | Fixed income, including money market
Revenue and Services [Line Items]
Average assets under management	82,400.0	85,900.0	84,400.0	84,100.0
Period end assets under management	78,700.0		78,700.0		85,300.0
U.S. mutual funds | Multi-asset
Revenue and Services [Line Items]
Average assets under management	202,000.0	230,100.0	211,100.0	226,300.0
Period end assets under management	187,500.0		187,500.0		232,200.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products
Revenue and Services [Line Items]
Net revenues	497.0	689.7	1,231.7	1,327.3
Average assets under management	696,000.0	737,100.0	728,700.0	715,800.0
Period end assets under management	652,600.0		652,600.0		816,400.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Equity
Revenue and Services [Line Items]
Average assets under management	342,900.0	427,700.0	368,900.0	418,100.0
Period end assets under management	308,700.0		308,700.0		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	92,400.0	91,300.0	91,900.0	91,000.0
Period end assets under management	92,400.0		92,400.0		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	218,200.0	218,100.0	225,800.0	206,700.0
Period end assets under management	208,400.0		208,400.0		245,500.0
Subadvised funds, separate accounts, collective investment trusts, and other investment products | Alternatives
Revenue and Services [Line Items]
Average assets under management	42,500.0	0.0	42,100.0	0.0
Period end assets under management	43,100.0		43,100.0		$ 41,700.0
Other clients
Revenue and Services [Line Items]
Net revenues	31.1	30.3	63.5	61.5
Investment advisory fees
Revenue and Services [Line Items]
Net revenues	1,496.7	1,787.2	3,158.8	3,475.0
Investment advisory fees | U.S. mutual funds
Revenue and Services [Line Items]
Net revenues	876.2	1,097.5	1,852.7	2,147.7
Investment advisory fees | U.S. mutual funds | Equity
Revenue and Services [Line Items]
Net revenues	604.5	768.0	1,296.4	1,497.8
Investment advisory fees | U.S. mutual funds | Fixed income, including money market
Revenue and Services [Line Items]
Net revenues	68.7	59.9	132.7	118.9
Investment advisory fees | U.S. mutual funds | Multi-asset
Revenue and Services [Line Items]
Net revenues	203.0	269.6	423.6	531.0
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products
Revenue and Services [Line Items]
Net revenues	620.5	689.7	1,306.1	1,327.3
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Equity
Revenue and Services [Line Items]
Net revenues	336.5	446.0	730.6	870.2
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	41.2	40.8	83.8	78.3
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Multi-asset
Revenue and Services [Line Items]
Net revenues	174.5	202.9	358.5	378.8
Investment advisory fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products | Alternatives
Revenue and Services [Line Items]
Net revenues	68.3	0.0	133.2	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	119.4	112.1	249.6	222.0
Administrative fees | U.S. mutual funds
Revenue and Services [Line Items]
Net revenues	85.5	81.8	178.6	160.5
Administrative fees | Subadvised funds, separate accounts, collective investment trusts, and other investment products
Revenue and Services [Line Items]
Net revenues	2.8	0.0	7.5	0.0
Administrative fees | Other clients
Revenue and Services [Line Items]
Net revenues	31.1	30.3	63.5	61.5
Distribution and servicing fees
Revenue and Services [Line Items]
Net revenues	23.2	30.0	49.5	59.1
Distribution and servicing fees | U.S. mutual funds
Revenue and Services [Line Items]
Net revenues	23.2	30.0	49.5	59.1
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	(126.3)	$ 0.0	(81.9)	$ 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	(126.3)		(81.9)
Capital allocation-based income | Other clients
Revenue and Services [Line Items]
Net revenues	$ 0.0		$ 0.0

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