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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Pension and post-retirement plans:        
Tax $ 0.0 $ 0.0 $ 0.0 $ 0.0
Unrealized loss on available for sale securities:        
Tax 0.0 0.0 0.0 0.0
Derivative financial instruments revaluation:        
Before reclassification adjustments, tax 0.9 0.0 3.1 0.0
Reclassification adjustment, tax $ 0.0 $ 0.0 $ 0.0 $ 0.0