Goodwill and Intangibles, including DAC and VOBA - Summary of Amortization Expense of Definite Lived Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended		15 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jul. 01, 2012	Jul. 01, 2013
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 85.0	$ 220.6	$ 158.5	$ 43.0
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	11.6	33.3	30.0	10.1
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	4.3	12.2	9.8	3.6
Technology assets [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	4.4	12.0	6.7	2.4
Definite Lived Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 20.3	$ 57.5	$ 46.5	$ 16.1