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Investments - Available-for-Sale Securities (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Schedule of Investments [Line Items]                
Document Period End Date     Jun. 30, 2015          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 1,148.1 $ 930.6 $ 1,148.1 $ 930.6 $ 1,222.9 $ 1,066.0 $ 755.6 $ 523.5
Total Gains (Losses) Included in Earnings (13.8) 1.5 (4.9) 2.1        
Total investments, Carrying Value 19,497.9   19,497.9     19,252.5    
Available-for-sale Debt Securities, Amortized Cost Basis 17,388.5   17,388.5          
Total investments, Cost or Amortized Cost 19,112.6   19,112.6     18,409.8    
Investments, Unrealized Losses (321.4)   (321.4)     (158.4)    
Investments, Unrealized Gains 706.7   706.7     1,001.1    
Total investment, Estimated Fair Value 19,497.9   19,497.9     19,252.5    
Total Gains (Losses) Included in AOCI (24.1) 15.9 4.3 20.5        
Purchases   191.0 186.8 425.3        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 1.6 1.0 1.6 1.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 53.4 13.5 87.1 15.9        
Net transfer In (Out) of Level 3 (a) 18.1 [1] (18.9) [2] (15.4) [3] (23.9) [4]        
Asset-backed Securities [Member]                
Schedule of Investments [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 33.1 5.9 33.1 5.9 34.3 37.0 10.7 5.0
Total Gains (Losses) Included in Earnings 0.0   0.1          
Total Gains (Losses) Included in AOCI (0.1)   (0.1) (0.3)        
Purchases 0.0   6.7 5.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0.1   0.2          
Net transfer In (Out) of Level 3 (a) (1.0) [3] (4.8) [2] (10.4) [3] (3.8) [4]        
Commercial Mortgage Backed Securities [Member]                
Schedule of Investments [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 140.1 83.9 140.1 83.9 142.5 83.1   5.7
Total Gains (Losses) Included in AOCI (1.9) 0.1 0.4 0.4        
Purchases   83.8 57.7 83.8        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0.5   1.1          
Net transfer In (Out) of Level 3 (a) [4]       (6.0)        
Corporate Debt Securities [Member]                
Schedule of Investments [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 916.9 745.2 916.9 745.2 941.1 850.0 657.0 461.1
Total Gains (Losses) Included in Earnings 0.0   2.3          
Total Gains (Losses) Included in AOCI (20.0) 14.4 3.3 18.4        
Purchases 0.0 88.9 122.4 283.2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 1.6 1.0 1.6 1.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 2.6   35.4 2.4        
Net transfer In (Out) of Level 3 (a)   (14.1) [2] (24.1) [3] (14.1) [4]        
Municipals [Member]                
Schedule of Investments [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 37.5 36.5 37.5 36.5 39.8 37.2 35.6  
Total Gains (Losses) Included in Earnings 0.0   0.0          
Total Gains (Losses) Included in AOCI (2.1) 0.9 0.7 1.5        
Purchases 0.0   0.0 35.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0.0   0.0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0.2   0.4          
Net transfer In (Out) of Level 3 (a) 0.0 [1]   0.0 [3]          
Non Agency Residential Mortgage Backed Securities [Member]                
Schedule of Investments [Line Items]                
Unrealized gains included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities 0.9   0.9          
Unrealized losses included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities (1.9)   (1.9)          
Other Marketable Securities, Current 15,964.0   15,964.0     15,009.3    
Equity Securities [Member]                
Schedule of Investments [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 6.0 0.0 6.0 0.0 $ 6.0 6.0 $ 10.8 $ 10.7
Total Gains (Losses) Included in Earnings   1.2   1.3        
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 46.1   46.1     31.2    
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (4.4)   (4.4)     (50.0)    
Available-for-sale Securities, Equity Securities 621.5   621.5     768.1    
Total investments, Carrying Value 621.5   621.5     768.1    
Available-for-sale Equity Securities, Amortized Cost Basis 579.8   579.8     786.9    
Total Gains (Losses) Included in AOCI 0.0 0.0 0.0 0.0        
Purchases 0.0 1.5 0.0 1.5        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0.0 0.0 0.0 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0.0 13.5 0.0 13.5        
Net transfer In (Out) of Level 3 (a) 0.0 [1] $ 0.0 [2] 0.0 [3] $ 0.0 [4]        
Equity Securities [Member] | Equity Securities Available For Sale [Member]                
Schedule of Investments [Line Items]                
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 22.9   22.9     23.0    
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (4.4)   (4.4)     (5.1)    
Available-for-sale Securities, Equity Securities 579.6   579.6     663.6    
Total investments, Carrying Value 579.6   579.6     663.6    
Available-for-sale Equity Securities, Amortized Cost Basis 561.1   561.1     645.7    
Equity Securities [Member] | Held for trading [Member]                
Schedule of Investments [Line Items]                
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 23.2   23.2     8.2    
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax           (44.9)    
Available-for-sale Securities, Equity Securities 41.9   41.9     104.5    
Total investments, Carrying Value 41.9   41.9     104.5    
Available-for-sale Equity Securities, Amortized Cost Basis 18.7   18.7     141.2    
Fixed-maturity securities, available-for-sale [Member]                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 613.6   613.6     846.5    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (278.5)   (278.5)     (103.7)    
Available-for-sale Securities, Debt Securities 17,723.6   17,723.6     17,211.5    
Total investments, Carrying Value 17,723.6   17,723.6     17,211.5    
Available-for-sale Debt Securities, Amortized Cost Basis 17,388.5   17,388.5     16,468.7    
Fixed-maturity securities, available-for-sale [Member] | Asset-backed Securities [Member]                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 4.9   4.9     10.9    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (24.1)   (24.1)     (18.8)    
Available-for-sale Securities, Debt Securities 1,887.5   1,887.5     1,792.9    
Total investments, Carrying Value 1,887.5   1,887.5     1,792.9    
Available-for-sale Debt Securities, Amortized Cost Basis 1,906.7   1,906.7     1,800.8    
Fixed-maturity securities, available-for-sale [Member] | Commercial Mortgage Backed Securities [Member]                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 14.4   14.4     21.3    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (7.0)   (7.0)     (2.0)    
Available-for-sale Securities, Debt Securities 821.6   821.6     636.9    
Total investments, Carrying Value 821.6   821.6     636.9    
Available-for-sale Debt Securities, Amortized Cost Basis 814.2   814.2     617.6    
Fixed-maturity securities, available-for-sale [Member] | Corporate Debt Securities [Member]                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 346.2   346.2     499.2    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (173.6)   (173.6)     (48.9)    
Available-for-sale Securities, Debt Securities 9,551.1   9,551.1     9,795.8    
Total investments, Carrying Value 9,551.1   9,551.1     9,795.8    
Available-for-sale Debt Securities, Amortized Cost Basis 9,378.5   9,378.5     9,345.5    
Fixed-maturity securities, available-for-sale [Member] | Hybrids [Member]                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 46.4   46.4     52.2    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (28.9)   (28.9)     (15.2)    
Available-for-sale Securities, Debt Securities 1,241.1   1,241.1     1,316.1    
Total investments, Carrying Value 1,241.1   1,241.1     1,316.1    
Available-for-sale Debt Securities, Amortized Cost Basis 1,223.6   1,223.6     1,279.1    
Fixed-maturity securities, available-for-sale [Member] | Municipals [Member]                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 91.9   91.9     116.2    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (19.8)   (19.8)     (6.3)    
Available-for-sale Securities, Debt Securities 1,450.6   1,450.6     1,259.8    
Total investments, Carrying Value 1,450.6   1,450.6     1,259.8    
Available-for-sale Debt Securities, Amortized Cost Basis 1,378.5   1,378.5     1,149.9    
Fixed-maturity securities, available-for-sale [Member] | Agency residential mortgage-backed securities [Member]                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 100.6   100.6     140.3    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (24.7)   (24.7)     (11.1)    
Available-for-sale Securities, Debt Securities 2,175.4   2,175.4     2,114.0    
Total investments, Carrying Value 2,175.4   2,175.4     2,114.0    
Available-for-sale Debt Securities, Amortized Cost Basis 2,099.5   2,099.5     1,984.8    
Fixed-maturity securities, available-for-sale [Member] | U.S. Government securities [Member]                
Schedule of Investments [Line Items]                
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 9.2   9.2     6.4    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (0.4)   (0.4)     (1.4)    
Available-for-sale Securities, Debt Securities 596.3   596.3     296.0    
Total investments, Carrying Value 596.3   596.3     296.0    
Available-for-sale Debt Securities, Amortized Cost Basis 587.5   587.5     291.0    
Derivative Financial Instruments, Assets [Member]                
Schedule of Investments [Line Items]                
Trading Securities, Cost 211.9   211.9     177.7    
Trading Securities 220.4   220.4     296.3    
Other Investments Gross Unrealized Gain 47.0   47.0     123.3    
Other Short Term Investments Gross Unrealized Losses (38.5)   (38.5)     (4.7)    
Asset based loan receivables [Member]                
Schedule of Investments [Line Items]                
Trading Securities, Cost 490.0   490.0     811.6    
Trading Securities 490.0   490.0     811.6    
Other Invested Assets [Member]                
Schedule of Investments [Line Items]                
Trading Securities, Cost           164.9    
Trading Securities           165.0    
Other Investments Gross Unrealized Gain           $ 0.1    
Other Invested Assets [Member] | Other Investments Asset [Member] | All Other Securities [Member]                
Schedule of Investments [Line Items]                
Trading Securities, Cost 442.4   442.4          
Trading Securities 442.4   442.4          
Other Investments Gross Unrealized Gain 0.0   0.0          
Other Short Term Investments Gross Unrealized Losses $ 0.0   $ 0.0          
[1] (a) During the three months ended June 30, 2015, the net transfers out of Level 3 were exclusively to Level 2 and the net transfer to Level 3 was related to a loan receivable previously eliminated upon consolidation.
[2] (a) The net transfers out of Level 3 for the three months ended June 30, 2014 were exclusively to Level 2.
[3] (a) During the nine months ended June 30, 2015, the net transfers out of Level 3 were exclusively to Level 2 and the net transfer to Level 3 was related to a loan receivable previously eliminated upon consolidation.
[4] (a) The net transfers out of Level 3 for the nine months ended June 30, 2014 were exclusively to Level 2. There was a $6.0 transfer to asset-backed securities from commercial mortgage-backed securities, the remaining transfers were from Level 3 to Level 2.