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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest $ 2.5 $ (63.8)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 74.0 (15.2)
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax (445.9) 0.0
Net income 578.9 260.8
Other comprehensive income (loss):    
Foreign currency translation losses (2.0) (46.1)
Net unrealized gain on derivative instruments    
Changes in derivative instruments before reclassification adjustment (0.8) 43.2
Net reclassification adjustment for losses (gains) included in net income 2.6 (4.8)
Changes in derivative instruments after reclassification adjustment 1.8 38.4
Changes in deferred income tax asset/liability   (14.2)
Net unrealized gain on hedging derivative instruments 1.8 24.2
Actuarial adjustments to pension plans    
Changes in actuarial adjustments before reclassification adjustment (0.7) 3.2
Net reclassification adjustment 0.8 1.3
Changes in actuarial adjustments to pension plans 0.1 4.5
Changes in deferred income tax asset/liability   (1.3)
Deferred tax valuation allowance adjustments   0.1
Net actuarial adjustments to pension plans 0.1 3.3
Unrealized investment gains (losses):    
Changes in unrealized investment gains (losses) before reclassification adjustment 26.0 (667.0)
Net reclassification adjustment for gains included in net income (6.3) (2.1)
Changes in unrealized investment gains (losses) after reclassification adjustment 19.7 (669.1)
Adjustments to intangible assets (0.9) 225.3
Changes in deferred income tax asset/liability (6.7) 154.7
Net unrealized gains (losses) on investments 12.1 (289.1)
Non-credit related other-than-temporary impairment:    
Net change to derive comprehensive income (loss) for the period (433.9) (307.7)
Comprehensive income (loss) 145.0 (46.9)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 71.0 $ (31.7)