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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) |  |
Income tax relating to changes in fair value of investments | $ 0.3 | $ 0.0
Income tax relating to investments sold | 0.0 | 0.0
Income tax relating to changes in fair value of derivative instruments designated as cash flow hedges | 4.8 | 10.6
Income tax relating to derivatives settled | $ (5.9) | $ (1.1)

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