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Debt (Collateralized Investment Borrowings) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term Debt $ 908.5 $ 909.0
Collateralized Investment Borrowings Due In One Year Or Less [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year $ 93.1  
Debt, Weighted Average Interest Rate 2.61%  
Collateralized Investment Borrowings Due After One Year To Two Years [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Year Two $ 92.0  
Debt, Weighted Average Interest Rate 2.73%  
Collateralized Investment Borrowings Due After Two Year To Three Years [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Year Three $ 2.6  
Debt, Weighted Average Interest Rate 2.71%  
Collateralized Investment Borrowings [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 187.7