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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Investment Advisory Services) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Net revenues	$ 1,468.7	$ 1,426.7	$ 1,395.2	$ 1,327.3	$ 1,305.0	$ 1,394.6	$ 1,345.0	$ 1,328.0	$ 5,617.9	$ 5,372.6	$ 4,854.9
Average assets under management									1,109,300.0	1,036,500.0	909,000.0
Period end assets under management	1,206,800.0				962,300.0				1,206,800.0	962,300.0
U.S. mutual funds
Disaggregation of Revenue [Line Items]
Net revenues									3,854.3	3,815.2	3,560.6
Average assets under management									640,400.0	621,800.0	568,500.0
Period end assets under management	682,700.0				564,500.0				682,700.0	564,500.0
U.S. mutual funds | Equity and blended assets
Disaggregation of Revenue [Line Items]
Average assets under management									513,600.0	493,600.0	447,500.0
Period end assets under management	552,400.0				441,100.0				552,400.0	441,100.0
U.S. mutual funds | Fixed income, including money market
Disaggregation of Revenue [Line Items]
Average assets under management									126,800.0	128,200.0	121,000.0
Period end assets under management	130,300.0				123,400.0				130,300.0	123,400.0
Subadvised and separate accounts and other investment products
Disaggregation of Revenue [Line Items]
Net revenues									1,660.0	1,475.6	1,215.8
Average assets under management									468,900.0	414,700.0	340,500.0
Period end assets under management	524,100.0				397,800.0				524,100.0	397,800.0
Subadvised and separate accounts and other investment products | Equity and blended assets
Disaggregation of Revenue [Line Items]
Average assets under management									362,500.0	317,300.0	256,400.0
Period end assets under management	412,100.0				299,200.0				412,100.0	299,200.0
Subadvised and separate accounts and other investment products | Fixed income, including money market
Disaggregation of Revenue [Line Items]
Average assets under management									106,400.0	97,400.0	84,100.0
Period end assets under management	$ 112,000.0				$ 98,600.0				112,000.0	98,600.0
Other clients
Disaggregation of Revenue [Line Items]
Net revenues									103.6	81.8	78.5
Investment advisory fees
Disaggregation of Revenue [Line Items]
Net revenues									5,112.5	4,850.6	4,295.8
Investment advisory fees | U.S. mutual funds
Disaggregation of Revenue [Line Items]
Net revenues									3,452.5	3,375.0	3,080.0
Investment advisory fees | U.S. mutual funds | Equity and blended assets
Disaggregation of Revenue [Line Items]
Net revenues									2,952.2	2,858.1	2,571.7
Investment advisory fees | U.S. mutual funds | Fixed income, including money market
Disaggregation of Revenue [Line Items]
Net revenues									500.3	516.9	508.3
Investment advisory fees | Subadvised and separate accounts and other investment products
Disaggregation of Revenue [Line Items]
Net revenues									1,660.0	1,475.6	1,215.8
Investment advisory fees | Subadvised and separate accounts and other investment products | Equity and blended assets
Disaggregation of Revenue [Line Items]
Net revenues									1,405.0	1,236.8	1,009.4
Investment advisory fees | Subadvised and separate accounts and other investment products | Fixed income, including money market
Disaggregation of Revenue [Line Items]
Net revenues									255.0	238.8	206.4
Investment advisory fees | Other clients
Disaggregation of Revenue [Line Items]
Net revenues									0.0	0.0	0.0
Administrative fees
Disaggregation of Revenue [Line Items]
Net revenues									385.4	384.0	412.1
Administrative fees | U.S. mutual funds
Disaggregation of Revenue [Line Items]
Net revenues									281.8	302.2	333.6
Administrative fees | Subadvised and separate accounts and other investment products
Disaggregation of Revenue [Line Items]
Net revenues									0.0	0.0	0.0
Administrative fees | Other clients
Disaggregation of Revenue [Line Items]
Net revenues									103.6	81.8	78.5
Distribution and servicing fees
Disaggregation of Revenue [Line Items]
Net revenues									120.0	138.0	147.0
Distribution and servicing fees | U.S. mutual funds
Disaggregation of Revenue [Line Items]
Net revenues									120.0	138.0	147.0
Distribution and servicing fees | Subadvised and separate accounts and other investment products
Disaggregation of Revenue [Line Items]
Net revenues									0.0	0.0	0.0
Distribution and servicing fees | Other clients
Disaggregation of Revenue [Line Items]
Net revenues									$ 0.0	$ 0.0	$ 0.0

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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