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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Millions | 12 Months Ended
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Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net (loss) income | $ (582.1) | $ (330.5) | $ 81.8
Other comprehensive loss, net of reclassifications: |  |  |
Net (loss) gain on derivative instruments (net of tax effect of ($1.1), $0.6, and ($0.7)) | (1.1) | (27.1) | 39.3
Change in net unrealized gain (loss) on available-for-sale securities (net of tax effect of ($0.5), $0.0, and ($0.2)) | 1.3 | (1.4) | (0.2)
Change in defined benefit pension items (net of tax effect of ($0.9), $0.9, and $1.8) | (5.5) | (4.6) | (16.0)
Net change in cumulative foreign currency translation loss (net of tax effect of $0.2, $0.5, and $4.9) | (52.1) | (34.7) | (75.8)
Total other comprehensive loss | (57.4) | (67.8) | (52.7)
Total comprehensive (loss) income | $ (639.5) | $ (398.3) | $ 29.1

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