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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME / (LOSS) CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME / (LOSS) (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Pension and post-retirement actuarial gains / (losses), tax $ 0.3 $ 0.6 $ (2.9)
Cash flow hedges, tax $ 0.0 $ 0.6 $ 0.0