CONSOLIDATED STATEMENTS OF PERMANENT EQUITY (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Total Stockholder’s Equity	Noncontrolling Interest
Permanent equity, beginning balance at Sep. 30, 2010	$ 1,177.9	$ 1.4	$ 855.8	$ (150.3)	$ (5.2)	$ 701.7	$ 476.2
Common stock, shares issued, beginning balance at Sep. 30, 2010		139,200,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	7.3			42.0		42.0	(34.7)
Unrealized investment gains, net	159.3				159.3	159.3
Non-credit related other-than-temporary impairments	0.2				0.2	0.2
Other unrealized gains	4.4				2.3	2.3	2.1
Actuarial adjustments to pension plans	(2.1)				(1.7)	(1.7)	(0.4)
Translation adjustment	(10.6)				(5.2)	(5.2)	(5.4)
Comprehensive (loss) income	158.5					196.9	(38.4)
Issuance (purchase) of subsidiary stock	26.4		(0.4)		(0.3)	(0.7)	27.1
Exercise of stock options, shares		200,000
Exercise of stock options, value	0.4		0.4			0.4
Stock compensation	30.5		16.6			16.6	13.9
Restricted stock surrendered for tax withholding	(2.6)		(1.4)			(1.4)	(1.2)
Capital contribution from a principal stockholder	1.7		1.7			1.7
Preferred stock dividends and accretion	(19.8)			(19.8)		(19.8)
Permanent equity, ending balance at Sep. 30, 2011	1,373.0	1.4	872.7	(128.1)	149.4	895.4	477.6
Common stock, shares issued, ending balance at Sep. 30, 2011		139,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	110.7			89.5		89.5	21.2
Unrealized investment gains, net	275.6				275.6	275.6
Non-credit related other-than-temporary impairments	(0.6)				(0.6)	(0.6)
Other unrealized gains	1.5				0.8	0.8	0.7
Actuarial adjustments to pension plans	(11.7)				(6.6)	(6.6)	(5.1)
Translation adjustment	(8.6)				(4.4)	(4.4)	(4.2)
Comprehensive (loss) income	366.9					354.3	12.6
Issuance (purchase) of subsidiary stock	(85.0)		(26.0)		(1.0)	(27.0)	(58.0)
Stock compensation, shares		800,000
Stock compensation	31.2		16.6			16.6	14.6
Restricted stock surrendered for tax withholding	(4.0)		(2.1)			(2.1)	(1.9)
Preferred stock dividends and accretion	(59.6)			(59.6)		(59.6)
Dividend paid by subsidiary to noncontrolling interest	(23.6)						(23.6)
Permanent equity, ending balance at Sep. 30, 2012	1,598.9	1.4	861.2	(98.2)	413.2	1,177.6	421.3
Common stock, shares issued, ending balance at Sep. 30, 2012	140,184,000	140,200,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(69.0)			(45.8)		(45.8)	(23.2)
Unrealized investment gains, net	(323.5)				(323.5)	(323.5)
Non-credit related other-than-temporary impairments
Other unrealized gains	(2.5)				(1.5)	(1.5)	(1.0)
Actuarial adjustments to pension plans	5.8				4.1	4.1	1.7
Translation adjustment	(6.6)				(3.7)	(3.7)	(2.9)
Comprehensive (loss) income	(395.8)					(370.4)	(25.4)
Repurchase of common stock, shares		(1,700,000)
Repurchase of common stock, value	(12.3)		(12.3)			(12.3)
Issuance (purchase) of subsidiary stock	(77.1)		(58.8)		(0.9)	(59.7)	(17.4)
Exercise of stock options, value
Stock compensation, shares		3,100,000
Stock compensation	57.6		44.5			44.5	13.1
Restricted stock surrendered for tax withholding	(22.3)		(13.8)			(13.8)	(8.5)
Preferred stock dividends and accretion	(48.4)			(48.4)		(48.4)
Conversion of preferred stock, shares		800,000
Conversion of preferred stock, value	7.2		7.2			7.2
Noncontrolling interest in acquired subsidiary	43.0						43.0
Dividend paid by subsidiary to noncontrolling interest	(17.3)						(17.3)
Permanent equity, ending balance at Sep. 30, 2013	$ 1,133.5	$ 1.4	$ 828.0	$ (192.4)	$ 87.7	$ 724.7	$ 408.8
Common stock, shares issued, ending balance at Sep. 30, 2013	142,381,100	142,400,000