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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Investment Advisory Services) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Revenue and Services [Line Items]
Investment advisory fees	$ 1,189.2	$ 1,158.2	$ 1,098.9	$ 1,046.0	$ 992.7
Administrative fees	102.2				104.7
Distribution and servicing fees	36.6				35.2
Net revenues	1,328.0	1,297.6	$ 1,238.7	$ 1,186.0	1,132.6
Average assets under management	1,025,500.0				845,400.0
Period end assets under management	1,014,200.0	991,100.0
U.S. mutual funds [Member]
Revenue and Services [Line Items]
Investment advisory fees	832.9				717.4
Administrative fees	81.8				86.3
Distribution and servicing fees	36.6				35.2
Net revenues	951.3				838.9
Average assets under management	622,000.0				536,500.0
Period end assets under management	612,900.0	606,300.0
U.S. mutual funds [Member] | Equity and blended asset [Member]
Revenue and Services [Line Items]
Investment advisory fees	705.5				594.2
Average assets under management	494,600.0				421,000.0
Period end assets under management	484,100.0	480,500.0
U.S. mutual funds [Member] | Fixed income and money market [Member]
Revenue and Services [Line Items]
Investment advisory fees	127.4				123.2
Average assets under management	127,400.0				115,500.0
Period end assets under management	128,800.0	125,800.0
Subadvised and separately managed accounts and other investment products [Member]
Revenue and Services [Line Items]
Investment advisory fees	356.3				275.3
Administrative fees	0.0				0.0
Distribution and servicing fees	0.0				0.0
Net revenues	356.3				275.3
Average assets under management	403,500.0				308,900.0
Period end assets under management	401,300.0	384,800.0
Subadvised and separately managed accounts and other investment products [Member] | Equity and blended asset [Member]
Revenue and Services [Line Items]
Investment advisory fees	297.0				227.9
Average assets under management	308,200.0				231,600.0
Period end assets under management	304,800.0	291,900.0
Subadvised and separately managed accounts and other investment products [Member] | Fixed income and money market [Member]
Revenue and Services [Line Items]
Investment advisory fees	59.3				47.4
Average assets under management	95,300.0				77,300.0
Period end assets under management	96,500.0	$ 92,900.0
Other [Member]
Revenue and Services [Line Items]
Investment advisory fees	0.0				0.0
Administrative fees	20.4				18.4
Distribution and servicing fees	0.0				0.0
Net revenues	$ 20.4				$ 18.4

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Amount of revenue from providing administrative services, including, but not limited to, accounting, tax, legal, regulatory filing, and share registration activities of managed funds and investment accounts of independent third parties and related and affiliated entities.

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Amount of fees earned from providing investment advice and research to customers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(a),(d))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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Amount of revenue from providing investment advisory, asset management and administrative services, including, but not limited to, distribution and shareholder services, accounting, tax, legal, regulatory filing, share registration, and shareholder correspondence activities.

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