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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME / (LOSS) (UNAUDITED) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 29, 2019
Sep. 30, 2018
Statement of Comprehensive Income [Abstract]        
Pension and post-retirement actuarial gains / (losses), tax $ 0.1 $ 1.5 $ 0.3 $ 3.2