CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 101.7	$ (69.0)	$ 110.7
Other comprehensive income (loss):
Foreign currency translation losses	(32.5)	(6.6)	(8.6)
Net unrealized gain (loss) on derivative instruments
Changes in derivative instruments before reclassification adjustment	13.1	(2.0)	(1.8)
Net reclassification adjustment for losses (gains) included in net income	2.6	(0.9)	3.1
Changes in derivative instruments after reclassification adjustment	15.7	(2.9)	1.3
Changes in deferred income tax asset/liability	(4.2)	(0.2)	(0.7)
Deferred tax valuation allowance adjustments		0.6	0.9
Net unrealized gain (loss) on derivative instruments	11.5	(2.5)	1.5
Actuarial adjustments to pension plans
Changes in actuarial adjustments before reclassification adjustment	(8.7)	9.6	(15.4)
Net reclassification adjustment for losses included in cost of goods sold	0.6	1.6	0.9
Net reclassification adjustment for gains included in selling and general and administrative expenses	0.8	(0.2)
Changes in actuarial adjustments to pension plans	(7.3)	11.0	(14.5)
Changes in deferred income tax asset/liability	2.2	(5.1)	3.6
Deferred tax valuation allowance adjustments	(0.6)	(0.1)	(0.8)
Net actuarial adjustments to pension plans	(5.7)	5.8	(11.7)
Unrealized investment gains (losses):
Changes in unrealized investment gains (losses) before reclassification adjustment	627.5	(490.5)	906.5
Net reclassification adjustment for gains included in net income	(101.0)	(333.4)	(263.9)
Changes in unrealized investment gains (losses) after reclassification adjustment	526.5	(823.9)	642.6
Adjustments to intangible assets	(156.8)	327.3	(218.5)
Changes in deferred income tax asset/liability	(129.0)	173.1	(148.5)
Net unrealized gain (loss) on investments	240.7	(323.5)	275.6
Non-credit related other-than-temporary impairment:
Changes in non-credit related other-than-temporary impairment			(1.5)
Adjustments to intangible assets			0.6
Changes in deferred income tax asset/liability			0.3
Net change to derive comprehensive income (loss) for the period			(0.6)
Net change to derive comprehensive income (loss) for the period	214.0	(326.8)	256.2
Comprehensive income (loss)	315.7	(395.8)	366.9
Less: Comprehensive income (loss) attributable to the noncontrolling interest:
Net income (loss)	112.0	(23.2)	21.2
Other comprehensive income (loss)	32.6	(2.2)	(8.6)
Total comprehensive income (loss)	144.6	(25.4)	12.6
Comprehensive income (loss) attributable to the controlling interest	$ 171.1	$ (370.4)	$ 354.3