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THE COMPANY AND BASIS OF PREPARATION. (Impact on Condensed Consolidated Statements of Income) (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Condensed Income Statements, Captions [Line Items]
Net revenues	$ 1,394.6	$ 1,297.6	$ 1,238.7	$ 1,186.0	$ 1,132.6	$ 4,067.6	$ 3,557.3
Compensation and related costs	454.3	446.3	417.4	403.8	397.4	1,351.7	1,218.6
Distribution and servicing	71.4	70.6	67.4	64.8	59.8	213.3	192.0
Advertising and promotion	20.2	34.0	14.0	18.7	25.7	63.8	58.4
Product-related costs	37.9	35.1	37.9	34.4	38.6	117.1	110.9
Technology, occupancy, and facility costs	96.5	95.8	86.3	85.6	82.8	283.8	254.7
General, administrative, and other	73.7	84.8	67.2	71.1	56.6	218.8	194.9
Nonrecurring insurance recoveries related to Dell appraisal rights matter	0.0		0.0	0.0	(50.0)	0.0	(50.0)
Total operating expenses	754.0	766.6	690.2	678.4	610.9	2,248.5	1,979.5
Net operating income	640.6	531.0	548.5	507.6	521.7	1,819.1	1,577.8
Investment advisory fees [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues	1,263.3	1,158.2	1,098.9	1,046.0	992.7	3,666.9	3,137.6
Administrative, distribution, and servicing fees [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues	$ 131.3	139.4	139.8	140.0	139.9	$ 400.7	$ 419.7
As previously reported [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues		1,286.1	1,221.7	1,171.6	1,113.6
Compensation and related costs		446.3	417.4	403.8	397.4
Distribution and servicing		38.0	37.4	36.4	35.2
Advertising and promotion		33.8	14.0	18.6	25.6
Product-related costs		0.0	0.0	0.0	0.0
Technology, occupancy, and facility costs		90.4	84.0	83.1	81.0
General, administrative, and other		146.6	120.4	122.1	102.7
Nonrecurring insurance recoveries related to Dell appraisal rights matter				0.0	(50.0)
Total operating expenses		755.1	673.2	664.0	591.9
Net operating income		531.0	548.5	507.6	521.7
As previously reported [Member] | Investment advisory fees [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues		1,156.0	1,096.7	1,043.9	991.1
As previously reported [Member] | Administrative, distribution, and servicing fees [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues		130.1	125.0	127.7	122.5
Adjustment [Member] | Impact of ASC 606 [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues		11.5	17.0	14.4	19.0
Compensation and related costs		0.0	0.0	0.0	0.0
Distribution and servicing		2.4	2.1	2.0	1.7
Advertising and promotion		0.2	0.0	0.1	0.1
Product-related costs		9.1	14.5	12.0	17.2
Technology, occupancy, and facility costs		(0.1)	0.1	0.0	0.0
General, administrative, and other		(0.1)	0.3	0.3	0.0
Nonrecurring insurance recoveries related to Dell appraisal rights matter				0.0	0.0
Total operating expenses		11.5	17.0	14.4	19.0
Net operating income		0.0	0.0	0.0	0.0
Adjustment [Member] | Change in presentation [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues		0.0	0.0	0.0	0.0
Compensation and related costs		0.0	0.0	0.0	0.0
Distribution and servicing		30.2	27.9	26.4	22.9
Advertising and promotion		0.0	0.0	0.0	0.0
Product-related costs		26.0	23.4	22.4	21.4
Technology, occupancy, and facility costs		5.5	2.2	2.5	1.8
General, administrative, and other		(61.7)	(53.5)	(51.3)	(46.1)
Nonrecurring insurance recoveries related to Dell appraisal rights matter				0.0	0.0
Total operating expenses		0.0	0.0	0.0	0.0
Net operating income		0.0	0.0	0.0	0.0
Adjustment [Member] | Investment advisory fees [Member] | Impact of ASC 606 [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues		2.2	2.2	2.1	1.6
Adjustment [Member] | Investment advisory fees [Member] | Change in presentation [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues		0.0	0.0	0.0	0.0
Adjustment [Member] | Administrative, distribution, and servicing fees [Member] | Impact of ASC 606 [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues		9.3	14.8	12.3	17.4
Adjustment [Member] | Administrative, distribution, and servicing fees [Member] | Change in presentation [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues		$ 0.0	$ 0.0	$ 0.0	$ 0.0

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