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Fair Value Of Assets And Liabilities (Tri-Level Hierarchy, Carrying Value) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale investments $ 121.5 $ 154.0
Assets held for policyholders 9,230.5 8,224.2
Put option contracts 9.6 21.8
Total 10,082.2 9,205.8
Total (76.8) (84.2)
Foreign time deposits 28.5 26.9
Equity method investments 291.4 279.0
Cost method investments 5.7 5.8
Exchange Traded Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
UIT-related financial instruments sold, not yet purchased (2.7) (5.2)
US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial Instruments Sold, Not yet Purchased, Corporate Equities   (0.8)
Liability [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure (74.1) (78.2)
Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 478.4 476.2
Seed Money [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale investments 97.8 127.9
Trading investments 123.2 121.9
Collateralized Loan Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale investments 10.8 12.9
Other Debt Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale investments 12.9 13.2
Deferred Compensation Arrangements [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 81.8 170.5
Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 33.3 30.4
Corporate Equities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 1.1 1.2
UIT-Related Equity And Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 2.8 5.6
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets held for policyholders 9,230.5 8,224.2
Put option contracts 0.0 0.0
Total 10,048.9 9,157.9
Total (2.7) (6.0)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Exchange Traded Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
UIT-related financial instruments sold, not yet purchased (2.7) (5.2)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial Instruments Sold, Not yet Purchased, Corporate Equities   (0.8)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Liability [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0.0 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 478.4 476.2
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Seed Money [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale investments 97.8 127.9
Trading investments 123.2 121.9
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Collateralized Loan Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale investments 0.0 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Debt Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale investments 0.0 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Deferred Compensation Arrangements [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 81.8 170.5
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 33.3 30.4
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Equities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 1.1 1.2
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | UIT-Related Equity And Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 2.8 5.6
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets held for policyholders 0.0 0.0
Put option contracts 9.6 21.8
Total 20.4 21.8
Total 0.0 0.0
Significant Other Observable Inputs (Level 2) [Member] | Exchange Traded Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
UIT-related financial instruments sold, not yet purchased 0.0 0.0
Significant Other Observable Inputs (Level 2) [Member] | US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial Instruments Sold, Not yet Purchased, Corporate Equities   0.0
Significant Other Observable Inputs (Level 2) [Member] | Liability [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0.0 0.0
Significant Other Observable Inputs (Level 2) [Member] | Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 0.0 0.0
Significant Other Observable Inputs (Level 2) [Member] | Seed Money [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale investments 0.0 0.0
Trading investments 0.0 0.0
Significant Other Observable Inputs (Level 2) [Member] | Collateralized Loan Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale investments 10.8 0.0
Significant Other Observable Inputs (Level 2) [Member] | Other Debt Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale investments 0.0 0.0
Significant Other Observable Inputs (Level 2) [Member] | Deferred Compensation Arrangements [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 0.0 0.0
Significant Other Observable Inputs (Level 2) [Member] | Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 0.0 0.0
Significant Other Observable Inputs (Level 2) [Member] | Corporate Equities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 0.0 0.0
Significant Other Observable Inputs (Level 2) [Member] | UIT-Related Equity And Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 0.0 0.0
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets held for policyholders 0.0 0.0
Put option contracts 0.0 0.0
Total 12.9 26.1
Total (74.1) (78.2)
Significant Unobservable Inputs (Level 3) [Member] | Exchange Traded Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
UIT-related financial instruments sold, not yet purchased 0.0 0.0
Significant Unobservable Inputs (Level 3) [Member] | US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial Instruments Sold, Not yet Purchased, Corporate Equities   0.0
Significant Unobservable Inputs (Level 3) [Member] | Liability [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure (74.1) (78.2)
Significant Unobservable Inputs (Level 3) [Member] | Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 0.0 0.0
Significant Unobservable Inputs (Level 3) [Member] | Seed Money [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale investments 0.0 0.0
Trading investments 0.0 0.0
Significant Unobservable Inputs (Level 3) [Member] | Collateralized Loan Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale investments 0.0 12.9
Significant Unobservable Inputs (Level 3) [Member] | Other Debt Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale investments 12.9 13.2
Significant Unobservable Inputs (Level 3) [Member] | Deferred Compensation Arrangements [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 0.0 0.0
Significant Unobservable Inputs (Level 3) [Member] | Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 0.0 0.0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Equities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments 0.0 0.0
Significant Unobservable Inputs (Level 3) [Member] | UIT-Related Equity And Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading investments $ 0.0 $ 0.0