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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Variable Interest Entity [Line Items]      
Maximum exposure to loss related to VIEs   $ 209.2  
Unfunded commitments   19.5  
Certain commercial mortgage loans transferred $ 259.7    
Proceeds from securitization 269.8    
Realized gain on securitization 9.1    
Fair value of securities purchased $ 30.8    
Liabilities   27,561.5 $ 25,611.0
Assets of consolidated investment entities [1]   746.5 $ 0.0
CLO      
Variable Interest Entity [Line Items]      
Liabilities   82.8  
Collateralized Loan Obligations | Consolidated investment entities      
Variable Interest Entity [Line Items]      
Special purpose entities capitalized amount   $ 70.0  
Investment percentage in most subordinated debt tranche   9.40%  
Assets of consolidated investment entities   $ 72.8  
Unfunded commitments   9.0  
Real estate fund      
Variable Interest Entity [Line Items]      
Noncontrolling interest in Variable Interest Entity   10.9  
Real estate fund | Consolidated investment entities      
Variable Interest Entity [Line Items]      
Assets of consolidated investment entities   89.1  
Unfunded commitments   11.0  
Commercial Mortgage Loan Securitization      
Variable Interest Entity [Line Items]      
Maximum exposure to loss related to VIEs   $ 23.5  
[1] The following table presents information on assets and liabilities related to consolidated investment entities as of December 31, 2017 (there were no such entities as of December 31, 2016).