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Consolidated Investment Products (Beginning And Ending Fair Value Measurements For Level 3 Assets And Liabilities) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Net unrealized gains/losses attributable to investments $ 22.9       $ 25.4        
Fair Value, Inputs, Level 3 [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Beginning balance (Asset) 23.9 $ 0.0 $ 388.6 $ 308.1 23.9 $ 308.1 $ 388.6 $ 343.1 $ 363.9
Purchases (Asset) 23.9 23.9   2.1   19.2      
Sales (Asset) 0.0 0.0   (14.2)   (41.2)      
Gains and losses included in the Condensed Consolidated Statements of Income 0.0 0.0   (22.9)   25.4      
Transfers to Levels 1 and 2 0.0 0.0   0.0   (8.4)      
Ending balance (Asset) 23.9 0.0 388.6 308.1 23.9 308.1      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Beginning balance (Liability) 0.0 0.0   0.0 0.0 (5,149.6)      
Purchases (Liability) 0.0 0.0   0.0   0.0      
Sales (Liability) 0.0 0.0   0.0   0.0      
Net unrealized gains and losses included in other gains and losses 0.0 0.0   0.0   0.0      
Transfers to Levels 1 and 2 0.0 0.0   0.0   0.0      
Ending balance (Liability) 0.0 0.0 $ 0.0 0.0 0.0 0.0      
Fair Value, Inputs, Level 2 [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Transfers to Levels 1 and 2         7.8        
Fair Value, Inputs, Level 1 [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Transfers to Levels 1 and 2         0.6        
Accounting Standards Update 2014-13 [Member]                  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Cumulative Effect of New Accounting Principle in Period of Adoption                 $ (17.6)
Accounting Standards Update 2014-13 [Member] | Fair Value, Inputs, Level 3 [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Adjustment for adoption (Asset) 0.0 0.0              
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Adjustment for adoption (Liability) 0.0 0.0              
Accounting Standards Update 2015-02 [Member]                  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Cumulative Effect of New Accounting Principle in Period of Adoption             $ (733.5)    
Accounting Standards Update 2015-02 [Member] | Fair Value, Inputs, Level 3 [Member]                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Adjustment for adoption (Asset) 0.0 $ (388.6)   0.0   0.0      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Adjustment for adoption (Liability) $ 0.0     $ 0.0 $ 0.0 $ 5,149.6