CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net Income (Loss) Attributable to Parent	$ 2.1	$ (132.9)	$ 132.2	$ (191.5)
Net income (loss)	39.8	(93.0)	249.2	(70.1)
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	32.1	92.5	53.8	152.5
Other comprehensive income
Foreign currency translation gain (loss)	30.3	(13.7)	5.9	(6.0)
Net unrealized (loss) gain on derivative instruments
Changes in derivative instruments before reclassification adjustment	(43.9)	9.6	(11.1)	8.8
Net reclassification adjustment for (gains) losses included in net income	(2.6)	1.1	(11.2)	0.2
Changes in derivative instruments after reclassification adjustment	(46.5)	10.7	(22.3)	9.0
Changes in deferred income tax asset/liability	16.3	(2.9)	6.6	(1.4)
OtherComprehensiveIncomeLossDerivativesQualifyingAsHedges,DeferredTaxValuationAllowanceAdjustment				1.0
Net unrealized (loss) gain on derivative instruments	(30.2)	7.8	(15.7)	8.6
Actuarial adjustments to pension plans:
Changes in actuarial adjustments before reclassification adjustment	(5.4)	0.9	(3.0)	0.4
Net reclassification adjustment	1.4	0.6	4.0	1.8
Net actuarial adjustments to pension plans	(3.2)	1.2	0.7	1.7
Unrealized investment gains:
Changes in unrealized investment gains before reclassification adjustment	358.3	615.8	5.8	492.0
Net reclassification adjustment for losses (gains) included in net income	26.9	(0.1)	23.0	0.2
Changes in unrealized investment gains after reclassification adjustment	385.2	615.7	28.8	492.2
Adjustments to intangible assets	(113.6)	(220.4)	11.6	(164.3)
Changes in deferred income tax asset/liability	(94.4)	(138.1)	(14.3)	(116.0)
Net unrealized gains on investments	177.2	257.2	26.1	211.9
Non-credit related other-than-temporary impairment:
Net change to derive comprehensive income for the period	174.1	252.5	17.0	216.2
Comprehensive income	213.9	159.5	266.2	146.1
Less: Comprehensive income attributable to the noncontrolling interest:
Net income	37.7	39.9	117.0	121.4
Other comprehensive income	33.5	49.2	1.7	44.2
Total comprehensive income (loss)	71.2	89.1	118.7	165.6
Comprehensive income (loss) attributable to the controlling interest	142.7	70.4	147.5	(19.5)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	(4.0)	1.5	1.0	2.2
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	$ 0.8	$ (0.3)	$ (0.3)	$ (0.5)