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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) / INCOME (UNAUDITED) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Statement of Comprehensive Income [Abstract]    
Net (loss) / income $ (3.8) $ 9.9
Other comprehensive income / (loss)    
Net change in foreign currency translation adjustment 1.4 3.4
Pension and post-retirement actuarial gains / (losses), net of $0.1 and $0.4 tax, respectively 0.5 (3.9)
Cash flow hedges, net of $0.0 and $0.0 of tax, respectively 0.2 0.0
Other comprehensive income / (loss), net of tax 2.1 (0.5)
Total comprehensive (loss) / income $ (1.7) $ 9.4