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Fair Value of Financial Instruments - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Sep. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 19,111.1  
Asset Backed Loans And Other Invested Assets 335.8 $ 811.6
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Disclosure And Measurement 1,197.0 1,319.2
Financial Liabilities Fair Value Disclosure 0.0 0.0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Disclosure And Measurement 0.0 0.0
Debt Instrument, Fair Value Disclosure [1],[2] 6,492.0 5,308.5
Financial Liabilities Fair Value Disclosure 6,492.0 5,308.5
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Policy loans and other invested assets [1]   15.5
Asset Backed Loans And Other Invested Assets [1] 335.8  
Assets Fair Value Disclosure And Measurement 851.8 963.3
Debt Instrument, Fair Value Disclosure [1],[2] 22.3  
Liabilities Related to Investment Contracts, Fair Value Disclosure [1] 14,125.7 13,108.8
Financial Liabilities Fair Value Disclosure 14,148.0 13,108.8
Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Policy loans and other invested assets [1]   15.5
Asset Backed Loans And Other Invested Assets [1] 335.8  
Assets Fair Value Disclosure And Measurement 2,048.8 2,282.5
Debt Instrument, Fair Value Disclosure [1],[2] 6,514.3 5,308.5
Liabilities Related to Investment Contracts, Fair Value Disclosure [1] 14,125.7 13,108.8
Financial Liabilities Fair Value Disclosure 20,640.0 18,417.3
Reported Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Policy loans and other invested assets [1]   15.5
Asset Backed Loans And Other Invested Assets [1] 335.8  
Assets Fair Value Disclosure And Measurement 2,048.6 2,282.5
Debt Instrument, Fair Value Disclosure [1],[2] 6,382.7 5,157.8
Liabilities Related to Investment Contracts, Fair Value Disclosure [1] 15,620.4 14,555.4
Financial Liabilities Fair Value Disclosure 22,003.1 19,713.2
Fixed Maturities Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure [1] 1,197.0 1,319.2
Fixed Maturities Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure [1] 0.0 0.0
Fixed Maturities Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure [1] 0.0 0.0
Fixed Maturities Securities | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure [1] 1,197.0 1,319.2
Fixed Maturities Securities | Reported Value Measurement [Member] | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure [1] 1,197.0 1,319.2
Commercial Mortgage Loan [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Policy loans and other invested assets [1] 489.6 136.2
Commercial Mortgage Loan [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Policy loans and other invested assets [1]   136.2
Commercial Mortgage Loan [Member] | Reported Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Policy loans and other invested assets [1] 489.2 136.2
Commercial mortgage loans | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Policy loans and other invested assets [1] 26.4  
Asset Backed Loans And Other Invested Assets [1]   811.6
Commercial mortgage loans | Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Policy loans and other invested assets [1] 26.4  
Asset Backed Loans And Other Invested Assets [1]   811.6
Commercial mortgage loans | Reported Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Policy loans and other invested assets [1] 26.6  
Asset Backed Loans And Other Invested Assets [1]   $ 811.6
Commercial mortgage loans | Commercial Mortgage Loan [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 489.6  
[1] (a)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] (b)The fair values of debt set forth above are generally based on quoted or observed market prices.