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Goodwill and Intangibles, including DAC and VOBA - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2014	Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period			$ 1,046.4
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 90.0		$ 90.0
Intangible assets amortization method			straight-line method
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%
Indefinite-lived Intangible Assets Acquired			$ 349.7
Goodwill and Intangible Asset Impairment			(60.2)
Amortization of intangibles	99.6	$ 40.7	149.6	$ 121.5
Finite-Lived Intangible Assets, Accumulated Amortization	379.9		379.9		$ 323.2
2014	90.0		90.0
2015	90.0		90.0
2016	90.0		90.0
2017	90.0		90.0
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			(31.9)
Goodwill, Impairment Loss			(28.3)
VOBA [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	9.8		9.8
Cumulative adjustments for net unrealized investment gains	(114.9)		(114.9)		(164.2)
Amortization of intangibles	(23.6)	(10.8)	(37.6)	(34.9)
Finite-Lived Intangible Assets, Accumulated Amortization	(364.0)		(364.0)		(338.4)
2014	37.1		37.1
2015	31.3		31.3
2016	25.2		25.2
2017	20.3		20.3
DAC [Member]
Finite-Lived Intangible Assets [Line Items]
Cumulative adjustments for net unrealized investment gains	(36.9)		(36.9)		$ (55.5)
Amortization of intangibles	(53.7)	$ (9.4)	(48.0)	$ (25.4)
Deferred sales inducements, net of shadow adjustments	$ 51.1		$ 51.1			$ 32.7
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Accretion Rate, VOBA	4.00%		4.00%
Amortizable Life			2 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Accretion Rate, VOBA	5.00%		5.00%
Amortizable Life			20 years
Weighted Average [Member] | VOBA [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life			4 years 10 months 25 days
FOH [Member] | Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period			$ 16.2
Indefinite-lived Intangible Assets Acquired			$ 9.9

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