CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Stockholders' Equity [Abstract]
Net income	$ 141.5	$ 118.7	$ 84.1	$ 136.3
Other comprehensive income (loss)
Foreign currency translation gains (losses)	8.4	(7.8)	5.6	(25.4)
Net unrealized (loss) gain on derivative instruments
Changes in derivative instruments before reclassification adjustment	(3.0)	3.2	(3.9)	4.6
Net reclassification adjustment for losses (gains) included in net income	1.3	(0.5)	2.2	(0.1)
Changes in derivative instruments after reclassification adjustment	(1.7)	2.7	(1.7)	4.5
Changes in deferred income tax asset/liability	0.3	(0.4)	0.2	(1.5)
Deferred tax valuation allowance adjustments	(0.1)	(0.5)	(0.1)	(0.1)
Net unrealized (loss) gain on derivative instruments	(1.5)	1.8	(1.6)	2.9
Actuarial adjustments to pension plans
Changes in actuarial adjustments before reclassification adjustment	0.2	(0.6)	(0.4)	(2.2)
Net reclassification adjustment for losses included in cost of goods sold	0.2	0.3	0.4	1.0
Net reclassification adjustment for losses included in selling and general and administrative expenses	0.2	0.2	0.7	0.6
Net actuarial adjustments to pension plans	0.4	(0.1)	0.5	(0.3)
Unrealized investment gains (losses):
Changes in unrealized investment gains before reclassification adjustment	350.6	(559.2)	727.2	(379.1)
Net reclassification adjustment for gains included in net income	(71.5)	(35.3)	(89.8)	(281.8)
Changes in unrealized investment gains (losses) after reclassification adjustment	279.1	(594.5)	637.4	(660.9)
Adjustments to intangible assets	(86.1)	210.7	(191.2)	260.9
Changes in deferred income tax asset/liability	(68.8)	135.4	(156.4)	140.9
Net unrealized gain (loss) on investments	124.2	(248.4)	289.8	(259.1)
Non-credit related other-than-temporary impairment:
Net change to derive comprehensive income (loss) for the period	131.5	(254.5)	294.3	(281.9)
Comprehensive income (loss)	273.0	(135.8)	378.4	(145.6)
Less: Comprehensive income (loss) attributable to the noncontrolling interest:
Net income (loss)	43.2	15.1	88.1	(8.1)
Other comprehensive income (loss)	28.0	(2.5)	58.0	(9.6)
Total comprehensive income (loss)	71.2	12.6	146.1	(17.7)
Comprehensive income (loss) attributable to the controlling interest	201.8	(148.4)	232.3	(127.9)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	0.6	(0.1)	0.7	(0.6)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	(0.2)	0	(0.2)	0.2
Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Change in Deferred Tax Allowance	$ 0	$ 0		$ (0.1)