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Debt - Collateralized Investment Borrowings (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt $ 873.3 $ 909.0
Due in One Year or Less    
Debt Instrument [Line Items]    
Due in One Year or Less $ 98.0  
Weighted-average Interest Rate 2.71%  
Due after One Year to Two Years    
Debt Instrument [Line Items]    
Due after One Year to Two Years $ 54.4  
Weighted-average Interest Rate 2.75%  
Due after Two Years to Three Years    
Debt Instrument [Line Items]    
Due after Two Years to Three Years $ 2.6  
Weighted-average Interest Rate 2.73%  
Collateralized Investment Borrowings    
Debt Instrument [Line Items]    
Long-term debt $ 155.0