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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Deferred Tax Benefits (Income Taxes)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net deferred tax benefits (income taxes) on other comprehensive income before reclassifications	$ (10.3)	$ 0.5	$ 8.3
Total net deferred tax benefits	(11.8)	0.5	9.2
Reclassification adjustment recognized upon partial disposition of equity method investment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment recognized in the provision for income taxes upon deconsolidation of T. Rowe Price investment product	(1.7)	0.0	0.0
Reclassification adjustment recognized in the provision for income taxes upon deconsolidation of T. Rowe Price investment product
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment recognized in the provision for income taxes upon deconsolidation of T. Rowe Price investment product	0.2	0.0	0.9
Total accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total net deferred tax benefits	$ (11.8)	$ 0.5	$ 9.2

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