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Borrowings - CLO Term Loans (Details)
$ in Millions
Aug. 14, 2017
Aug. 02, 2017
EUR (€)
Jul. 20, 2017
Jun. 28, 2017
Apr. 19, 2017
Sep. 30, 2017
USD ($)
Feb. 28, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Oct. 03, 2013
EUR (€)
Debt Instrument [Line Items]                  
Debt principal amount           $ 1,517.6   $ 1,267.6  
CLO Term Loan Maturing September 2018                  
Debt Instrument [Line Items]                  
Debt principal amount | €                 € 12,600,000.0
CLO Term Loan Maturing July 2027                  
Debt Instrument [Line Items]                  
Debt principal amount           $ 20.6   20.6  
Effective interest rate (percent)           3.10%      
CLO Term Loan Maturing September 2029                  
Debt Instrument [Line Items]                  
Debt principal amount | €             € 61,800,000.0    
CLO Term Loan Maturing August 2022                  
Debt Instrument [Line Items]                  
Debt principal amount | €   € 17,400,000.0              
CLO Term Loans                  
Debt Instrument [Line Items]                  
Debt principal amount           $ 229.9   33.8  
Euribor | CLO Term Loan Maturing September 2018                  
Debt Instrument [Line Items]                  
Debt principal amount           0.0   13.2  
Euribor | CLO Term Loan Maturing September 2029                  
Debt Instrument [Line Items]                  
Debt principal amount           $ 73.0   0.0  
Effective interest rate (percent)           2.33%      
LIBOR | CLO Term Loan Maturing April 2031                  
Debt Instrument [Line Items]                  
Debt principal amount           $ 22.8   0.0  
Effective interest rate (percent)           3.24%      
Margin interest rate (as a percent)         1.932%        
LIBOR | CLO Term Loan Maturing July 2031                  
Debt Instrument [Line Items]                  
Debt principal amount           $ 23.1   0.0  
Effective interest rate (percent)           3.25%      
Margin interest rate (as a percent)       1.923%          
LIBOR | CLO Term Loan Maturing April 2027                  
Debt Instrument [Line Items]                  
Debt principal amount           $ 24.4   0.0  
Effective interest rate (percent)           2.84%      
Margin interest rate (as a percent)     1.536%            
LIBOR | CLO Term Loan Maturing July 2029                  
Debt Instrument [Line Items]                  
Debt principal amount           $ 22.8   0.0  
Effective interest rate (percent)           3.10%      
Margin interest rate (as a percent)   1.808%              
LIBOR | CLO Term Loan Maturing August 2022                  
Debt Instrument [Line Items]                  
Debt principal amount           $ 20.6   0.0  
Effective interest rate (percent)           1.75%      
Margin interest rate (as a percent)   1.75%              
LIBOR | CLO Term Loan Maturing August 2030                  
Debt Instrument [Line Items]                  
Debt principal amount           $ 22.6   $ 0.0  
Effective interest rate (percent)           3.16%      
Margin interest rate (as a percent) 1.848%