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Share-based compensation - Narratives (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award          
Share based compensation expense recognized $ 4.9 $ 4.1 $ 13.5 $ 10.5  
Proceeds from stock options exercised 0.1 0.0 2.8 1.6  
—Share options          
Share-based Compensation Arrangement by Share-based Payment Award          
Aggregate intrinsic value of options that were vested or expected to vest 14.7   $ 14.7    
Contractual term of options that were vested or expect to vest     6 years 10 months 24 days    
Aggregate intrinsic value of options exercisable 11.4   $ 11.4    
Contractual term of options exercisable     5 years 7 months 6 days    
Unrecognized compensation relating to non-vested awards 8.7   $ 8.7    
Unrecognized compensation relating to non-vested awards, recognition period (term)     2 years 2 months 12 days    
Unrecognized compensation relating to non-vested awards recognizable upon liquidity 25.0   $ 25.0    
Aggregate intrinsic value of options exercised 0.1 0.0 $ 2.2 2.0  
—PRSUs          
Share-based Compensation Arrangement by Share-based Payment Award          
Unrecognized compensation relating to non-vested awards, recognition period (term)     2 years    
Unrecognized compensation relating to non-vested awards other than option 17.1   $ 17.1    
RSU's and PRSU's          
Share-based Compensation Arrangement by Share-based Payment Award          
Unrecognized compensation relating to non-vested awards, recognition period (term)     2 years    
Unrecognized compensation relating to non-vested awards other than option 17.1   $ 17.1    
Aggregate intrinsic value of non options vested $ 0.1 $ 0.1 $ 2.8 $ 0.3  
Omaha Topco Ltd. Stock Incentive Plan | Tranche 1          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     20.00%    
Omaha Topco Ltd. Stock Incentive Plan | Tranche 2          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     20.00%    
Omaha Topco Ltd. Stock Incentive Plan | Tranche 3          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     20.00%    
Omaha Topco Ltd. Stock Incentive Plan | Tranche 4          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     20.00%    
Omaha Topco Ltd. Stock Incentive Plan | Tranche 5          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     20.00%    
Omaha Topco Ltd. Stock Incentive Plan | —RSUs          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period         3 years
Shares granted (shares)         76,293
Term of award         10 years
Omaha Topco Ltd. Stock Incentive Plan | —Tier I | —Share options          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period     5 years    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period     3 years    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period     4 years    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Tranche 1 | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Tranche 1 | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     25.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Tranche 2 | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Tranche 2 | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     25.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Tranche 3 | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Tranche 3 | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     25.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Tranche 4 | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     25.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —RSUs | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period     1 year    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —RSUs | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period     3 years    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —RSUs | Tranche 1          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —RSUs | Tranche 2          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —RSUs | Tranche 3          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —PRSUs          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of shares expected to vest upon achievement of average annual adjusted return on invested capital (percentage) 50.00%   50.00%    
Percentage of shares expected to vest upon achievement of certain relative shareholders return (percentage) 50.00%   50.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —PRSUs | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period     1 year    
Total number of shares expected to vest at term of award arrangement (percentage)     0.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —PRSUs | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period     3 years    
Total number of shares expected to vest at term of award arrangement (percentage)     200.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —PRSUs | Tranche 1          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —PRSUs | Tranche 2          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —PRSUs | Tranche 3          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —SARs | Tranche 1 | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —SARs | Tranche 1 | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     25.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —SARs | Tranche 2 | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —SARs | Tranche 2 | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     25.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —SARs | Tranche 3 | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —SARs | Tranche 3 | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     25.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —SARs | Tranche 4 | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     25.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Premium-priced options          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period     3 years    
Term of award     10 years    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Premium-priced options | Tranche 1          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Premium-priced options | Tranche 2          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%    
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Premium-priced options | Tranche 3          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting percentage     33.00%