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Investments Investments - Schedule of Commercial Mortgage Loans (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2015
Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Document Period End Date Jun. 30, 2015  
Loans Receivable, Gross, Commercial, Mortgage $ 403.9 $ 136.2
Commercial Mortgage Receivable, Percentage of Total 100.00% 100.00%
LTV Less Than 50 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 93.9 $ 45.4
Commercial Mortgage Receivable, Percentage of Total 23.30% 33.30%
LTV 50 to 60 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 148.0 $ 19.9
Commercial Mortgage Receivable, Percentage of Total 36.60% 14.60%
LTV 60 to 75 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 162.0 $ 70.9
Commercial Mortgage Receivable, Percentage of Total 40.10% 52.10%
Greater Than One Point Two Five [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 383.6 $ 135.4
Greater Than One Point Two Five [Member] | LTV Less Than 50 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 93.2 44.6
Greater Than One Point Two Five [Member] | LTV 50 to 60 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 128.4 19.9
Greater Than One Point Two Five [Member] | LTV 60 to 75 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 162.0 70.9
Greater Than One But Less Than One Point Two Five [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 19.6 0.0
Greater Than One But Less Than One Point Two Five [Member] | LTV Less Than 50 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 0.0 0.0
Greater Than One But Less Than One Point Two Five [Member] | LTV 50 to 60 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 19.6 0.0
Greater Than One But Less Than One Point Two Five [Member] | LTV 60 to 75 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 0.0 0.0
Ratio Not Available [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage [1] 0.7 0.8
Ratio Not Available [Member] | LTV Less Than 50 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage [1] 0.7 0.8
Ratio Not Available [Member] | LTV 50 to 60 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage [1] 0.0 0.0
Ratio Not Available [Member] | LTV 60 to 75 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage [1] 0.0 0.0
Estimate of Fair Value Measurement [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 403.9 $ 136.2
Commercial Mortgage Receivable, Percentage of Total 100.00% 100.00%
Estimate of Fair Value Measurement [Member] | LTV Less Than 50 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 93.9 $ 45.4
Commercial Mortgage Receivable, Percentage of Total 23.30% 33.30%
Estimate of Fair Value Measurement [Member] | LTV 50 to 60 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 148.0 $ 19.9
Commercial Mortgage Receivable, Percentage of Total 36.60% 14.60%
Estimate of Fair Value Measurement [Member] | LTV 60 to 75 Percent [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 162.0 $ 70.9
Commercial Mortgage Receivable, Percentage of Total 40.10% 52.10%
Industrial Property [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 9.2 $ 0.0
Commercial Mortgage Receivable, Percentage of Total 2.20% 0.00%
Warehouse [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 66.9 $ 48.0
Commercial Mortgage Receivable, Percentage of Total 16.60% 35.20%
Multifamily [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 56.8 $ 37.8
Commercial Mortgage Receivable, Percentage of Total 14.10% 27.80%
Hotel [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 12.5 $ 0.0
Commercial Mortgage Receivable, Percentage of Total 3.10% 0.00%
Office Building [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 128.9 $ 44.6
Commercial Mortgage Receivable, Percentage of Total 31.90% 32.70%
Retail Site [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 128.9 $ 5.8
Commercial Mortgage Receivable, Percentage of Total 31.90% 4.30%
Funeral Home [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 0.7 $ 0.0
Commercial Mortgage Receivable, Percentage of Total 0.20% 0.00%
East North Central US [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 113.3 $ 27.8
Commercial Mortgage Receivable, Percentage of Total 28.10% 20.40%
Middle Atlantic US [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 81.3 $ 10.9
Commercial Mortgage Receivable, Percentage of Total 20.10% 8.00%
Pacific US [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 81.2 $ 61.5
Commercial Mortgage Receivable, Percentage of Total 20.10% 45.10%
South Atlantic US [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 55.7 $ 0.0
Commercial Mortgage Receivable, Percentage of Total 13.80% 0.00%
West North Central US [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 5.6 $ 5.8
Commercial Mortgage Receivable, Percentage of Total 1.40% 4.30%
West South Central US [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 19.6 $ 30.2
Commercial Mortgage Receivable, Percentage of Total 4.90% 22.20%
Mountain [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 41.8 $ 0.0
Commercial Mortgage Receivable, Percentage of Total 10.30% 0.00%
New England [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 5.4 $ 0.0
Commercial Mortgage Receivable, Percentage of Total 1.30% 0.00%
[1] (a) N/A - Current financial information not available.