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Fair Value of Financial Instruments Fair Value of Financial Instruments - Assets and Liabilities Carrying at Fair Value Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2015
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Document Period End Date Jun. 30, 2015      
Cash and cash equivalents $ 1,293.2 $ 1,319.2 $ 1,455.9 $ 1,899.7
Derivatives 220.4 296.3    
Asset-backed loans 490.0 811.6    
Other invested assets 442.4 165.0    
Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed loans [1] 490.0 151.7    
Total debt [1],[2] 65.4      
Liabilities Related to Investment Contracts, Fair Value Disclosure [1] 14,016.1 13,108.8    
Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total debt [1],[2] 6,941.9 5,308.5    
Policy loans [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Policy loans and other invested assets [1] 427.9 811.6    
Other Invested Assets [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading Securities   165.0    
Reported Value Measurement [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed loans [1] 490.0 151.7    
Total financial assets [1] 2,211.1      
Total debt [1],[2] 6,832.7 5,157.8    
Liabilities Related to Investment Contracts, Fair Value Disclosure [1] 15,530.1 14,555.4    
Financial Liabilities Fair Value Disclosure [1] 22,362.8      
Reported Value Measurement [Member] | Policy loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Policy loans and other invested assets [1] 427.9 811.6    
Estimate of Fair Value Measurement [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset-backed loans [1] 490.0 151.7    
Total debt [1],[2] 7,007.3 5,308.5    
Liabilities Related to Investment Contracts, Fair Value Disclosure [1] 14,016.1 13,108.8    
Estimate of Fair Value Measurement [Member] | Policy loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Policy loans and other invested assets [1] 427.9 811.6    
Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent Purchase Price Reduction Receivable Fair Value Disclosure 0.0 41.5    
Funds Withheld Receivable [3] 641.7 154.4    
Assets, Fair Value Disclosure, Recurring 19,238.2 18,501.7    
Liabilities, Fair Value Disclosure, Recurring 2,773.1 2,062.2    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Funds Withheld Receivable [3] 0.0 0.0    
Assets, Fair Value Disclosure, Recurring 1,148.1 1,066.0    
Liabilities, Fair Value Disclosure, Recurring 2,768.3 2,059.4    
Total financial assets [1] 917.9 963.3    
Financial Liabilities Fair Value Disclosure [1] 14,081.5 13,108.8    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Funds Withheld Receivable [3] 45.8 0.0    
Assets, Fair Value Disclosure, Recurring 527.8 279.3    
Liabilities, Fair Value Disclosure, Recurring 0.0 0.0    
Total financial assets [1] 1,293.2 1,319.2    
Financial Liabilities Fair Value Disclosure [1] 0.0 0.0    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Funds Withheld Receivable [3] 595.9 154.4    
Assets, Fair Value Disclosure, Recurring 17,562.3 17,156.4    
Liabilities, Fair Value Disclosure, Recurring 4.8 2.8    
Total financial assets [1] 0.0 0.0    
Financial Liabilities Fair Value Disclosure [1] 6,941.9 5,308.5    
Fair Value, Measurements, Recurring [Member] | Commodity Option [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives 10.3 3.2    
Derivative Liability 1.6 0.4    
Fair Value, Measurements, Recurring [Member] | Commodity Option [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives 10.3 3.2    
Derivative Liability 1.6 0.4    
Fair Value, Measurements, Recurring [Member] | Fixed Index Annuity [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Liability 2,173.7 1,908.1    
Fair Value, Measurements, Recurring [Member] | Fixed Index Annuity [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Liability 2,173.7 1,908.1    
Fair Value, Measurements, Recurring [Member] | Front Street Future Policyholder Benefits Reserve [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Liability 594.6 151.3    
Fair Value, Measurements, Recurring [Member] | Future Contracts [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Liability   0.1    
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives 0.0 0.6    
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives 0.0 0.6    
Fair Value, Measurements, Recurring [Member] | Foreign exchange forward agreements [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives   12.8    
Derivative Liability 1.0 0.5    
Fair Value, Measurements, Recurring [Member] | Foreign exchange forward agreements [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives   12.8    
Derivative Liability 1.0 0.5    
Fair Value, Measurements, Recurring [Member] | Call options [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives 220.4 296.3    
Fair Value, Measurements, Recurring [Member] | Call options [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives 220.4 296.3    
Fair Value, Measurements, Recurring [Member] | Available For Sale Embedded Derivatives [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities - available-for-sale 579.6 663.6    
Fair Value, Measurements, Recurring [Member] | Available For Sale Embedded Derivatives [Member] | Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities - available-for-sale 26.7 59.2    
Fair Value, Measurements, Recurring [Member] | Available For Sale Embedded Derivatives [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities - available-for-sale 546.9 598.4    
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Liability 2.2 1.8    
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Liability 2.2 1.8    
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member] | Foreign exchange forward agreements [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives 6.2      
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member] | Foreign exchange forward agreements [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives 6.2      
Fair Value, Measurements, Recurring [Member] | Equity [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading Securities 41.9 104.5    
Fair Value, Measurements, Recurring [Member] | Equity [Member] | Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading Securities 41.9 104.5    
Fair Value, Measurements, Recurring [Member] | Other Invested Assets [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other invested assets 14.5 13.3    
Fair Value, Measurements, Recurring [Member] | Other Invested Assets [Member] | Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other invested assets 0.0 0.0    
Fair Value, Measurements, Recurring [Member] | Other Invested Assets [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other invested assets   2.1    
Fair Value, Measurements, Recurring [Member] | Reported Value Measurement [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total financial assets [1]   2,282.5    
Financial Liabilities Fair Value Disclosure [1]   19,713.2    
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total financial assets [1] 2,211.1 2,282.5    
Financial Liabilities Fair Value Disclosure [1] 21,023.4 18,417.3    
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Front Street Future Policyholder Benefits Reserve [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Liability 594.6 151.3    
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Future Contracts [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Liability   0.1    
Contingent Purchase Price Reduction Receivable [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent Purchase Price Reduction Receivable Fair Value Disclosure 0.0 41.5    
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 1,887.5 1,792.9    
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 33.1      
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 1,854.4 1,755.9    
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 821.6 636.9    
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 140.1      
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 681.5 553.8    
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 9,551.1 9,795.8    
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 916.9 850.0    
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 8,634.2 8,945.8    
Hybrids [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 1,241.1 1,316.1    
Hybrids [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 0.0 0.0    
Hybrids [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 1,241.1 1,316.1    
Municipals [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 1,450.6 1,259.8    
Municipals [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities   37.2    
Municipals [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 1,413.1 1,222.6    
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 2,175.4 2,114.0    
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 2,175.4 2,114.0    
Other Invested Assets [Member] | Fair Value, Measurements, Recurring [Member] | Other Invested Assets [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other invested assets 14.5 11.2    
Broker Quoted [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Available For Sale Embedded Derivatives [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities - available-for-sale 6.0 6.0    
Broker Quoted [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 33.1 37.0    
Broker Quoted [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 140.1 83.1    
Market Pricing [Member] | Municipal Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 37.5      
Option Pricing [Member] | Other Invested Assets [Member] | Fair Value, Measurements, Recurring [Member] | Other Invested Assets [Member] | Nomura Fund Linked Note [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other invested assets 11.7      
U.S. Government securities [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 596.3 296.0    
U.S. Government securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities 413.4 115.6    
U.S. Government securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities $ 182.9 $ 180.4    
[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.
[3] (a) included in other assets in the accompanying unaudited condensed Consolidated Balance Sheets.