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Investment Securities (Details 9) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Investments holding table    
Investment in Community Reinvestment Vehicle $ 14.1 $ 14.1
Investment in tax advantaged federal affordable housing development fund 21.2 21.8
Distributions from inactive hedge funds 1.6  
Redemption Requests 9.4  
Hedge funds and private equity funds
    
Investments holding table    
Other investments at fair value 121.6 119.2
Net asset value per share of unfunded commitments 14.9 16.1
Hedge funds
    
Investments holding table    
Other investments at fair value 53.8 53.5
Hedge funds | 30 - 59 days notice
    
Investments holding table    
Other investments at fair value 24.7  
Hedge funds | 60 - 89 days notice
    
Investments holding table    
Other investments at fair value 8.2  
Hedge funds | 90 - 119 days notice
    
Investments holding table    
Other investments at fair value 14.0  
Hedge funds | 120+ days notice
    
Investments holding table    
Other investments at fair value 6.9  
Hedge funds | Monthly
    
Investments holding table    
Other investments at fair value 6.7  
Hedge funds | Monthly | 120+ days notice
    
Investments holding table    
Other investments at fair value 6.7  
Hedge funds | Quarterly
    
Investments holding table    
Other investments at fair value 44.4  
Hedge funds | Quarterly | 30 - 59 days notice
    
Investments holding table    
Other investments at fair value 24.7  
Hedge funds | Quarterly | 60 - 89 days notice
    
Investments holding table    
Other investments at fair value 8.2  
Hedge funds | Quarterly | 90 - 119 days notice
    
Investments holding table    
Other investments at fair value 11.5  
Hedge funds | Annual
    
Investments holding table    
Other investments at fair value 2.7  
Hedge funds | Annual | 90 - 119 days notice
    
Investments holding table    
Other investments at fair value 2.5  
Hedge funds | Annual | 120+ days notice
    
Investments holding table    
Other investments at fair value 0.2  
Long/short equity
    
Investments holding table    
Other investments at fair value 36.0 36.1
Long/short credit and distressed
    
Investments holding table    
Other investments at fair value 15.0 15.1
Long bank loan
    
Investments holding table    
Other investments at fair value 0.2 0.2
Long/short equity activist
    
Investments holding table    
Other investments at fair value 2.6 2.1
Private equity funds
    
Investments holding table    
Other investments at fair value 67.8 65.7
Net asset value per share of unfunded commitments 14.9 16.1
Private equity funds | 1 - 3 years
    
Investments holding table    
Other investments at fair value 12.8  
Private equity funds | 3 - 5 years
    
Investments holding table    
Other investments at fair value 12.1  
Private equity funds | 5 - 10 years
    
Investments holding table    
Other investments at fair value 42.9  
Insurance
    
Investments holding table    
Other investments at fair value 3.0 3.3
Net asset value per share of unfunded commitments 0.1 0.1
Distressed residential real estate
    
Investments holding table    
Other investments at fair value 9.8 13.7
Energy infrastructure and services
    
Investments holding table    
Other investments at fair value 19.0 16.3
Net asset value per share of unfunded commitments 5.5 4.6
Healthcare
    
Investments holding table    
Other investments at fair value 2.1 1.1
Net asset value per share of unfunded commitments 2.7 3.5
Multi-sector
    
Investments holding table    
Other investments at fair value 20.7 19.3
Net asset value per share of unfunded commitments 4.3 5.2
Private equity secondaries
    
Investments holding table    
Other investments at fair value 7.3 7.6
Net asset value per share of unfunded commitments 2.2 2.6
Real estate
    
Investments holding table    
Other investments at fair value 5.9 4.4
Net asset value per share of unfunded commitments $ 0.1 $ 0.1