Investments (Tables) - USD ($)
$ in Millions

12 Months Ended

Sep. 30, 2015

Sep. 30, 2014

Sep. 30, 2013

Schedule of Available-for-sale Securities [Line Items]

Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities

$ 30.1

$ 0.7

$ 2.9

Available-for-Sale Securities

The Company’s consolidated investments are summarized as follows:



	September 30, 2015
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Carrying Value
Fixed-maturity securities, available-for sale
Asset-backed securities	$	1,902.6	$	5.0	$	(47.1	)	$	1,860.5	$	1,860.5
Commercial mortgage-backed securities	877.9		13.7		(9.4		)	882.2		882.2
Corporates	9,547.7		351.1		(354.1		)	9,544.7		9,544.7
Hybrids	1,210.8		44.8		(42.3		)	1,213.3		1,213.3
Municipals	1,519.7		103.0		(15.1		)	1,607.6		1,607.6
Residential mortgage-backed securities	2,099.4		89.4		(26.3		)	2,162.5		2,162.5
U.S. Government	233.4		10.6		—			244.0		244.0
Total fixed maturity securities	17,391.5		617.6		(494.3		)	17,514.8		17,514.8
Equity securities
Available-for-sale	593.4		27.2		(4.0		)	616.6		616.6
Held for trading	18.7		14.1		—			32.8		32.8
Total equity securities	612.1		41.3		(4.0		)	649.4		649.4
Derivatives	219.0		12.4		(149.5		)	81.9		81.9
Asset-based loans	335.8		—		—			335.8		335.8
Commercial mortgage loans	489.2		0.4		—			489.6		489.2
Other invested assets	39.6		—		—			39.6		39.6
Total investments	$	19,087.2	$	671.7	$	(647.8	)	$	19,111.1	$	19,110.7



	September 30, 2014
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Carrying Value
Fixed-maturity securities, available-for-sale
Asset-backed securities	$	1,800.8	$	10.9	$	(18.8	)	$	1,792.9	$	1,792.9
Commercial mortgage-backed securities	617.6		21.3		(2.0		)	636.9		636.9
Corporates	9,345.5		499.2		(48.9		)	9,795.8		9,795.8
Hybrids	1,279.1		52.2		(15.2		)	1,316.1		1,316.1
Municipals	1,149.9		116.2		(6.3		)	1,259.8		1,259.8
Residential mortgage-backed securities	1,984.8		140.3		(11.1		)	2,114.0		2,114.0
U.S. Government	291.0		6.4		(1.4		)	296.0		296.0
Total fixed maturity securities	16,468.7		846.5		(103.7		)	17,211.5		17,211.5
Equity securities
Available-for-sale	645.7		23.0		(5.1		)	663.6		663.6
Held for trading	141.2		8.2		(44.9		)	104.5		104.5
Total equity securities	786.9		31.2		(50.0		)	768.1		768.1
Derivatives	177.7		123.3		(4.7		)	296.3		296.3
Asset-based loans	811.6		—		—			811.6		811.6
Commercial mortgage loans	136.2		—		—			136.2		136.2
Other invested assets	28.7		0.1		—			28.8		28.8
Total investments	$	18,409.8	$	1,001.1	$	(158.4	)	$	19,252.5	$	19,252.5

Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities



	September 30, 2015
	Amortized Cost		Fair Value
Corporate, Non-structured Hybrids, Municipal and U.S. Government securities:
Due in one year or less	$	155.9	$	158.1
Due after one year through five years	1,800.7		1,818.2
Due after five years through ten years	2,947.6		2,947.3
Due after ten years	6,909.3		7,006.7
Subtotal	11,813.5		11,930.3
Other securities which provide for periodic payments:
Asset-backed securities	1,902.6		1,860.5
Commercial mortgage-backed securities	877.9		882.2
Structured hybrids	698.1		679.3
Residential mortgage-backed securities	2,099.4		2,162.5
Total fixed maturity available-for-sale securities	$	17,391.5	$	17,514.8

Fair Value and Gross Unrealized Losses of Available-for-Sale-Securities



	September 30, 2015
	Less than 12 months					12 months or longer					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Available-for-sale securities
Asset-backed securities	$	603.8	$	(13.8	)	$	833.1	$	(33.3	)	$	1,436.9	$	(47.1	)
Commercial mortgage-backed securities	262.1		(7.3		)	132.5		(2.1		)	394.6		(9.4		)
Corporates	2,342.4		(200.6		)	1,328.2		(153.5		)	3,670.6		(354.1		)
Equities	36.7		(0.3		)	106.0		(3.7		)	142.7		(4.0		)
Hybrids	87.6		(3.8		)	542.1		(38.5		)	629.7		(42.3		)
Municipals	220.5		(6.1		)	192.4		(9.0		)	412.9		(15.1		)
Residential mortgage-backed securities	423.1		(10.3		)	293.9		(16.0		)	717.0		(26.3		)
Total available-for-sale securities	$	3,976.2	$	(242.2	)	$	3,428.2	$	(256.1	)	$	7,404.4	$	(498.3	)
Total number of available-for-sale securities in an unrealized loss position			707					396					1,103



	September 30, 2014
	Less than 12 months					12 months or longer					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Available-for-sale securities
Asset-backed securities	$	825.8	$	(11.8	)	$	288.2	$	(7.0	)	$	1,114.0	$	(18.8	)
Commercial mortgage-backed securities	160.3		(0.9		)	0.4		(1.1		)	160.7		(2.0		)
Corporates	816.6		(16.3		)	1,127.8		(32.6		)	1,944.4		(48.9		)
Equities	180.4		(2.2		)	54.9		(2.9		)	235.3		(5.1		)
Hybrids	258.2		(2.3		)	290.0		(12.9		)	548.2		(15.2		)
Municipals	—		—			264.9		(6.3		)	264.9		(6.3		)
Residential mortgage-backed securities	298.5		(5.8		)	177.6		(5.3		)	476.1		(11.1		)
U.S Government	37.3		(0.1		)	81.7		(1.3		)	119.0		(1.4		)
Total available-for-sale securities	$	2,577.1	$	(39.4	)	$	2,285.5	$	(69.4	)	$	4,862.6	$	(108.8	)
Total number of available-for-sale securities in an unrealized loss position			319					310					629

Reconciliation of Other-than-Temporary Impairment on Fixed Maturity

Details underlying write-downs taken as a result of OTTI that were recognized in Net (loss) income and included in Net investment (losses) gains were as follows:



	Fiscal
	2015		2014		2013
OTTI recognized in net (loss) income:
Corporates	$	5.6	$	—	$	1.2
Municipals	0.3		0.3		—
Residential mortgage-backed securities	7.9		0.1		1.2
Other invested assets	16.3		0.3		0.5
Total	$	30.1	$	0.7	$	2.9

Portfolio of Asset-Backed Loans and Other Invested Assets

“Asset-based loans” in the accompanying Consolidated Balance Sheets as of September 30, 2015 and 2014, consisted of the following:



	September 30,
	2015		2014
Asset-based loans, net of deferred fees, by major industry:
Apparel	$	91.8	$	191.6
Jewelry	79.8		100.1
Electronics	70.8		245.4
Manufacturing	49.0		56.9
Home Furnishings	2.3		71.7
Other	102.2		153.1
Total asset-based loans	395.9		818.8
Less: Allowance for credit losses	60.1		7.2
Total asset-based loans, net	$	335.8	$	811.6

Schedule of Allowance for Credit Losses

Fiscal 2015, 2014 and 2013:



	Fiscal
	2015			2014		2013
Allowance for credit losses:
Balance at beginning of year	$	7.2		$	5.2	$	1.4
Provision for credit losses	129.5			2.0		3.8
Charge-offs	(76.6		)	—		—
Balance at end of year	$	60.1		$	7.2	$	5.2

Schedule of Credit Quality of Asset-Based Loan Portfolio



	Internal Risk Rating
	Pass		Special Mention		Substandard		Doubtful		Total
September 30, 2015	$	131.9	$	40.7	$	97.8	$	125.5	$	395.9
September 30, 2014	$	195.3	$	372.7	$	250.8	$	—	$	818.8

Net Investment Income

The major sources of “Net investment income” in the accompanying Consolidated Statements of Operations were as follows:



	Fiscal
	2015			2014			2013
Fixed maturity available-for-sale securities	$	846.6		$	767.8		$	679.0
Equity available-for-sale securities	35.7			22.8			14.8
Asset-based loans	42.9			61.1			42.6
Commercial mortgage loans	11.4			3.5			1.4
Other investments	9.8			4.6			13.7
Gross investment income	946.4			859.8			751.5
External investment expense	(19.2		)	(17.6		)	(16.8		)
Net investment income	$	927.2		$	842.2		$	734.7

Net Investment Gains

“Net investment (losses) gains” reported in the accompanying Consolidated Statements of Operations were as follows:



	Fiscal
	2015			2014			2013
Net realized gains on fixed maturity available-for-sale securities	$	48.6		$	101.3		$	330.0
Realized (losses) gains on equity securities	(4.0		)	13.5			12.6
Net realized gains on securities	44.6			114.8			342.6
Realized gains on certain derivative instruments	118.6			233.8			148.6
Unrealized (losses) gains on certain derivative instruments	(231.9		)	37.7			20.5
Change in fair value of other embedded derivatives	(1.0		)	(0.1		)	—
Change in fair value of derivatives	(114.3		)	271.4			169.1
Realized (losses) gains on other invested assets and funds withheld receivables	(35.0		)	9.1			(0.1		)
Net investment (losses) gains	$	(104.7	)	$	395.3		$	511.6

Cash Flows from Consolidated Investing Activities by Security



	Fiscal
	2015			2014			2013
Proceeds from investments sold, matured or repaid:
Available-for-sale	$	4,939.3		$	5,084.1		$	8,986.9
Trading (acquired for holding)	70.8			54.9			92.9
Derivatives and other	443.6			470.2			352.4
	$	5,453.7		$	5,609.2		$	9,432.2
Cost of investments acquired:
Available-for-sale	$	(5,685.2	)	$	(6,741.2	)	$	(8,757.5	)
Trading (acquired for holding)	—			(99.7		)	(20.8		)
Derivatives and other	(713.1		)	(380.5		)	(162.5		)
	$	(6,398.3	)	$	(7,221.4	)	$	(8,940.8	)