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Fair Value of Financial Instruments - Financial Assets and Liabilities Not Measured at Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Asset based loans $ 560.4 $ 180.1
Fair Value, Measurements, Recurring | Fair Value
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Asset based loans 560.4 [1] 180.1 [1]
Total financial assets 591.6 233.9
Total debt 4,773.2 [1],[2] 2,328.8 [1],[3]
Investment contracts, included in contractholder funds 12,378.6 [1] 12,271.9 [1]
Total financial liabilities 17,528.9 14,969.6
Fair Value, Measurements, Recurring | Carrying Amount
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Asset based loans 560.4 [1] 180.1 [1]
Total financial assets 591.6 233.9
Total debt 4,896.1 [1],[2] 2,167.0 [1],[3]
Investment contracts, included in contractholder funds 13,703.8 [1] 13,739.6 [1]
Total financial liabilities 18,929.3 16,225.8
Fair Value, Measurements, Recurring | Level 1
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Asset based loans    [1]    [1]
Total financial assets 0 0
Total debt    [1],[2] 524.0 [1],[3]
Investment contracts, included in contractholder funds    [1]    [1]
Total financial liabilities 0 524.0
Fair Value, Measurements, Recurring | Level 2
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Asset based loans    [1]    [1]
Total financial assets 0 35.0
Total debt 4,773.2 [1],[2] 1,804.8 [1],[3]
Investment contracts, included in contractholder funds    [1]    [1]
Total financial liabilities 4,773.2 1,804.8
Fair Value, Measurements, Recurring | Level 3
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Asset based loans 560.4 [1] 180.1 [1]
Total financial assets 591.6 198.9
Total debt    [1],[2]    [1],[3]
Investment contracts, included in contractholder funds 12,378.6 [1] 12,271.9 [1]
Total financial liabilities 12,755.7 12,640.8
Fair Value, Measurements, Recurring | Total fixed maturities | Fair Value
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
U.S. Treasuries and certificate of deposit, held-to-maturity   35.0 [1]
Fair Value, Measurements, Recurring | Total fixed maturities | Carrying Amount
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
U.S. Treasuries and certificate of deposit, held-to-maturity   35.0 [1]
Fair Value, Measurements, Recurring | Total fixed maturities | Level 1
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
U.S. Treasuries and certificate of deposit, held-to-maturity      [1]
Fair Value, Measurements, Recurring | Total fixed maturities | Level 2
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
U.S. Treasuries and certificate of deposit, held-to-maturity   35.0 [1]
Fair Value, Measurements, Recurring | Total fixed maturities | Level 3
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
U.S. Treasuries and certificate of deposit, held-to-maturity      [1]
Fair Value, Measurements, Recurring | Policy loans | Fair Value
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Policy loans and other invested assets 31.2 [1] 18.8 [1]
Fair Value, Measurements, Recurring | Policy loans | Carrying Amount
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Policy loans and other invested assets 31.2 [1] 18.8 [1]
Fair Value, Measurements, Recurring | Policy loans | Level 1
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Policy loans and other invested assets    [1]    [1]
Fair Value, Measurements, Recurring | Policy loans | Level 2
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Policy loans and other invested assets    [1]    [1]
Fair Value, Measurements, Recurring | Policy loans | Level 3
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Policy loans and other invested assets $ 31.2 [1] $ 18.8 [1]
[1] The carrying amounts of trade receivables, accounts payable, accrued investment income and portions of other insurance liabilities approximate fair value due to their short duration and, accordingly, they are not presented in the tables above.
[2] (a)The fair values of debt set forth above are generally based on quoted or observed market prices.
[3] The fair values of cash equivalents and equity investments set forth above are generally based on quoted or observed market prices.