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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, 2020
Sep. 27, 2020
Jun. 28, 2020
Mar. 29, 2020
Dec. 31, 2019
Sep. 29, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 82.1 $ 77.7 $ 76.6 $ 88.4 $ 82.3 $ 90.8 $ 98.0 $ 102.3 $ 324.8 $ 373.4 $ 401.9
Gross profit 19.9 18.9 18.0 24.1 19.7 24.4 30.4 29.2 80.9 103.7 117.9
Operating income 8.4 5.3 5.8 9.0 6.2 7.1 5.9 (0.5) 28.5 18.7 33.6
Net income from continuing operations $ 6.6 $ 2.4 $ 4.6 $ 7.2 $ 1.6 $ 6.3 $ 4.1 $ (3.3) $ 20.8 $ 8.7 $ 27.7
Earnings per ordinary share                      
Basic from continuing operations (in usd per share) $ 0.24 $ 0.09 $ 0.17 $ 0.26 $ 0.06 $ 0.23 $ 0.15 $ (0.12) $ 0.75 [1] $ 0.32 [1] $ 1.04 [1]
Diluted from continuing operations (in usd per share) $ 0.24 $ 0.09 $ 0.16 $ 0.26 $ 0.06 $ 0.23 $ 0.15 $ (0.12) $ 0.74 [1] $ 0.31 [1] $ 1.00 [1]
[1] (1) The calculation of earnings per share is performed separately for continuing and discontinued operations. As a result, the sum of the two in any particular year may not equal the earnings-per-share amount in total.