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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ (36.6) | $ (51.4) | $ 542.3 | $ 209.4
Other comprehensive (loss) income: |  |  |  |
Foreign currency translation gains (losses) | 24.2 | 21.7 | 22.2 | (24.4)
Net unrealized (loss) gain on derivative instruments |  |  |  |
Changes in derivative instruments before reclassification adjustment | (18.4) | (10.4) | (19.2) | 32.8
Net reclassification adjustment for losses (gains) included in net income | 3.1 | (3.8) | 5.7 | (8.6)
Changes in derivative instruments after reclassification adjustment | (15.3) | (14.2) | (13.5) | 24.2
Changes in deferred income tax asset/liability | 3.7 | 4.5 | 3.7 | (9.7)
Net unrealized (loss) gain on hedging derivative instruments | (11.6) | (9.7) | (9.8) | 14.5
Actuarial adjustments to pension plans |  |  |  |
Changes in actuarial adjustments before reclassification adjustment | (1.5) | (0.8) | (2.2) | 2.4
Net reclassification adjustment | 0.8 | 1.3 | 1.6 | 2.6
Changes in actuarial adjustments to pension plans | (0.7) | 0.5 | (0.6) | 5.0
Changes in deferred income tax asset/liability | 0.2 | 0.2 | 0.2 | (1.1)
Deferred tax valuation allowance adjustments | 0.0 | (0.1) | 0.0 | 0.0
Net actuarial adjustments to pension plans | (0.5) | 0.6 | (0.4) | 3.9
Unrealized investment gains (losses): |  |  |  |
Changes in unrealized investment gains (losses) before reclassification adjustment | 0.0 | 314.5 | 26.0 | (352.5)
Net reclassification adjustment for gains included in net income | 0.0 | (1.8) | (6.3) | (3.9)
Changes in unrealized investment gains (losses) after reclassification adjustment | 0.0 | 312.7 | 19.7 | (356.4)
Adjustments to intangible assets | 0.0 | (100.1) | (0.9) | 125.2
Changes in deferred income tax asset/liability | 0.0 | (74.6) | (6.7) | 80.1
Net unrealized gains (losses) on investments | 0.0 | 138.0 | 12.1 | (151.1)
Deconsolidation of Insurance Operations | 0.0 | 0.0 | (445.9) | 0.0
Non-credit related other-than-temporary impairment: |  |  |  |
Net change to derive comprehensive income (loss) for the period | 12.1 | 150.6 | (421.8) | (157.1)
Comprehensive (loss) income | (24.5) | 99.2 | 120.5 | 52.3
Less: Net income attributable to noncontrolling interest | 0.5 | 30.7 | 72.0 | 79.3
Less: Other comprehensive income (loss) attributable to noncontrolling interest | 5.1 | 32.0 | 7.6 | (31.8)
Comprehensive income attributable to noncontrolling interest | 5.6 | 62.7 | 79.6 | 47.5
Comprehensive (loss) income attributable to the controlling interest | $ (30.1) | $ 36.5 | $ 40.9 | $ 4.8

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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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