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Borrowings - CLO Term Loans (Details)
€ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 03, 2013
EUR (€)
Debt Instrument [Line Items]      
Debt principal amount $ 1,334.0 $ 1,267.6  
October 2013 CLO Term Loan      
Debt Instrument [Line Items]      
Loan maturity date Sep. 28, 2018 Sep. 28, 2018  
Debt principal amount $ 13.5 $ 13.2 € 12.6
Debt Instrument, Interest Rate, Effective Percentage 1.75%    
CLO 2016-2 Retention Term Loan      
Debt Instrument [Line Items]      
Loan maturity date Jul. 15, 2027  
Debt principal amount $ 20.6 $ 20.6  
Debt Instrument, Interest Rate, Effective Percentage 2.82%    
CLO Term Loans      
Debt Instrument [Line Items]      
Debt principal amount $ 34.1 $ 33.8