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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2014
Sep. 30, 2015
Dec. 31, 2013
Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]        
Estimated litigation liability   $ 11.1 $ 21.2 $ 17.5
Change in estimated litigation liability $ (2.3)      
Legal fees paid $ 7.8      
Unfunded commitments to limited partnerships   28.5    
Unfunded commitments to secured bank loans   $ 13.9