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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances $ 5,008.6  
Other comprehensive income (loss) (16.9)  
Balances 5,000.2  
Net unrealized holding gains [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances 52.2  
Other comprehensive income (loss) before reclassifications and income taxes 18.3  
Reclassification adjustments recognized in non-operating income (47.6)  
Other comprehensive income (loss), before taxes (29.3)  
Net deferred tax benefits (income taxes) 11.5 $ 23.1
Other comprehensive income (loss) (17.8)  
Balances 34.4  
Currency translation adjustments [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances (40.7)  
Other comprehensive income (loss) before reclassifications and income taxes 1.7  
Reclassification adjustments recognized in non-operating income 0.0  
Other comprehensive income (loss), before taxes 1.7  
Net deferred tax benefits (income taxes) (0.8) (6.7)
Other comprehensive income (loss) 0.9  
Balances (39.8)  
Currency translation adjustments [Member] | Equity method investments [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances (32.3)  
Other comprehensive income (loss) before reclassifications and income taxes (3.2)  
Reclassification adjustments recognized in non-operating income 0.0  
Other comprehensive income (loss), before taxes (3.2)  
Net deferred tax benefits (income taxes) 1.1  
Other comprehensive income (loss) (2.1)  
Balances (34.4)  
Currency translation adjustments [Member] | Consolidated sponsored investment portfolios - variable interest entities [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances (8.4)  
Other comprehensive income (loss) before reclassifications and income taxes 4.9  
Reclassification adjustments recognized in non-operating income 0.0  
Other comprehensive income (loss), before taxes 4.9  
Net deferred tax benefits (income taxes) (1.9)  
Other comprehensive income (loss) 3.0  
Balances (5.4)  
Total accumulated other comprehensive income (loss) [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances 11.5  
Other comprehensive income (loss) before reclassifications and income taxes 20.0  
Reclassification adjustments recognized in non-operating income (47.6)  
Other comprehensive income (loss), before taxes (27.6)  
Net deferred tax benefits (income taxes) 10.7 $ 16.4
Other comprehensive income (loss) (16.9)  
Balances $ (5.4)