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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)

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