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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Foreign currency translation:      
Before reclassification adjustment, tax $ 0.0 $ 0.0 $ 0.0
Reclassification adjustment, tax 0.0    
Pension and post-retirement plans:      
Before reclassification adjustments, tax (0.9) (1.6) 2.2
Reclassification adjustment, tax     2.1
Unrealized (loss) gain on available for sale securities:      
Before reclassification adjustments, tax benefit     0.4
Reclassification adjustment, tax     0.0
Derivative financial instrument revaluation:      
Before reclassification adjustment, tax 0.0 1.5 4.3
Reclassification adjustment, tax $ 1.5 $ 0.0 $ 0.0