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Securitizations and Variable Interest Entities - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Feb. 27, 2015
Variable Interest Entity [Line Items]      
Long-term debt $ 5,801.9 $ 5,575.4  
Document Period End Date Sep. 30, 2017    
Gain (Loss) on Extinguishment of Debt   (8.0)  
Salus Capital Partners LLC      
Variable Interest Entity [Line Items]      
Long-term debt $ 22.2 30.3  
Cash 2.0    
Variable Interest Entity, Primary Beneficiary | Salus Capital Partners LLC      
Variable Interest Entity [Line Items]      
Variable Interest Entity, Consolidated, Carrying Amount, Asset-Backed Loans Receivable 0.0 29.3  
Collateralized Loan Obligations [Member] | Salus Capital Partners LLC      
Variable Interest Entity [Line Items]      
Long-term debt     $ 578.5
Unaffiliated long-term debt of consolidated variable-interest entity | Salus Capital Partners LLC      
Variable Interest Entity [Line Items]      
Long-term debt 28.9 39.7  
Unsecured Debt [Member] | Variable Interest Entity, Primary Beneficiary | Salus Capital Partners LLC      
Variable Interest Entity [Line Items]      
VIE, consolidated carrying amount obligations 99.2 135.2  
FGL [Member] | Salus Capital Partners LLC      
Variable Interest Entity [Line Items]      
Long-term debt $ 48.1 $ 65.9