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Investments Composition of Fixed Maturities by Maturity (Detail)
$ in Millions
Sep. 30, 2016
USD ($)
Available for sale, cost  
Less than one year $ 3,251.2
One to five years 7,471.8
Five to ten years 2,862.2
Ten years or greater 122.8
Total 13,708.0
Available for sale, Fair value  
Less than one year 3,269.8
One to five years 7,552.0
Five to ten years 2,960.3
Ten years or greater 134.8
Total $ 13,916.9