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Selected Quarterly Data (unaudited) - Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 29, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jul. 01, 2018
Apr. 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 99.5 $ 107.1 $ 116.5 $ 120.4 $ 110.9 $ 129.1 $ 128.2 $ 119.7 $ 443.5 $ 487.9 $ 441.3
Gross profit 21.7 25.2 31.0 30.1 24.2 34.0 33.6 30.3 108.0 122.1 108.6
Operating (loss) / income 1.7 6.6 5.2 (1.1) (13.1) 15.7 14.6 12.8 12.4 30.0 21.9
Net income $ (2.4) $ 5.8 $ 3.5 $ (3.8) $ (8.5) $ 12.2 $ 11.4 $ 9.9 $ 3.1 $ 25.0 $ 16.6
Earnings per ordinary share                      
Basic earnings per ordinary share (usd per share) $ (0.09) $ 0.21 $ 0.13 $ (0.14) $ (0.31) $ 0.46 $ 0.43 $ 0.37 $ 0.11 $ 0.94 $ 0.63
Diluted earnings per ordinary share (usd per share) $ (0.09) $ 0.21 $ 0.13 $ (0.14) $ (0.31) $ 0.44 $ 0.42 $ 0.36 $ 0.11 $ 0.90 $ 0.62