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Commitments and Contingencies - Unfunded lending commitments (Details)
$ in Millions
Sep. 30, 2015
USD ($)
Other Commitments [Line Items]  
Contractual Obligation $ 248.5
Asset-based loans  
Other Commitments [Line Items]  
Contractual Obligation 103.6
Other invested assets  
Other Commitments [Line Items]  
Contractual Obligation 81.2
Commercial Mortgage Loan [Member]  
Other Commitments [Line Items]  
Contractual Obligation 27.4
Fixed-maturity securities, available-for-sale  
Other Commitments [Line Items]  
Contractual Obligation 20.0
Other assets  
Other Commitments [Line Items]  
Contractual Obligation $ 16.3