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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) / INCOME (UNAUDITED) CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) / INCOME (UNAUDITED) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Statement of Comprehensive Income [Abstract]    
Pension and post-retirement actuarial gains / (losses), tax $ 0.1 $ 0.4
Cash flow hedges, tax $ 0.0 $ 0.0