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Consolidated Investment Products Consolidated Investment Products (Adoption of ASU 2015-02) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Item Effected [Line Items]        
Cash and cash equivalents of consolidated investment products $ 742.2 $ 363.3    
Accounts receivable and other assets of CIP 106.2 173.5    
Investments Of Consolidated Investment Products 5,116.1 6,016.1    
Assets 25,734.3 25,073.2    
Debt of CIP 4,403.1 5,437.0    
Other liabilities of consolidated investment products 673.4 273.7    
Liabilities 17,838.8 16,210.2    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 7,611.8 8,695.7 $ 9,119.8 $ 8,977.3
Liabilities and Equity 25,734.3 $ 25,073.2    
Accounting Standards Update 2015-02 [Member]        
Item Effected [Line Items]        
Cash and cash equivalents of consolidated investment products 163.8      
Accounts receivable and other assets of CIP 68.8      
Investments Of Consolidated Investment Products 2,938.0      
Assets 3,170.6      
Debt of CIP 2,259.2      
Other liabilities of consolidated investment products 110.4      
Liabilities 2,369.6      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 801.0      
Liabilities and Equity 3,170.6      
Accounting Standards Update 2015-02 [Member] | Consolidation, Eliminations [Member]        
Item Effected [Line Items]        
Cash and cash equivalents of consolidated investment products 33.8      
Accounts receivable and other assets of CIP 105.4      
Investments Of Consolidated Investment Products 319.3      
Assets 458.5      
Debt of CIP 0.0      
Other liabilities of consolidated investment products 102.4      
Liabilities 102.4      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 356.1      
Liabilities and Equity $ 458.5