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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Other comprehensive loss:        
Income tax expense (benefit) on translation adjustments on net investment hedge $ (0.4) $ 13.1 $ 11.4 $ 13.7
Income tax expense (benefit) on unrealized gain on investments (0.1) 0.4 (0.4) 1.7
Income tax expense on defined benefit pension plans and retiree health care plan $ 0.2 $ 0.1 $ 0.7 $ 0.5