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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Other comprehensive income (loss):    
Income tax expense (benefit) on translation adjustments on net investment hedge $ (12.0) $ 16.9
Income tax expense (benefit) on unrealized gain on investments (0.1) 0.4
Income tax expense on defined benefit pension plans and retiree health care plan $ (0.3) $ 0.2