Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule of Error Correction (Details)

v3.24.0.1
Summary of Significant Accounting Policies - Schedule of Error Correction (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 30, 2023
Dec. 31, 2022
Jan. 01, 2022
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue $ 1,066.4 $ 1,019.5 $ 750.1
Product revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue 909.8 890.9 636.8
Service revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue 156.6 128.6 113.3
As previously reported      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue   1,019.5 750.1
As previously reported | Product revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue   873.1 619.9
As previously reported | Service revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue   146.4 130.2
Correction | Product revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue   17.8 16.9
Correction | Service revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue   (17.8) (16.9)
Janus North America | Operating Segments      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue 1,028.4 994.3 714.9
Janus North America | Operating Segments | As previously reported      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue   994.3 714.9
Janus North America | Operating Segments | Product revenues transferred at a point in time | Product revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue 784.0 795.0 544.9
Janus North America | Operating Segments | Product revenues transferred at a point in time | As previously reported | Product revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue   880.0 614.8
Janus North America | Operating Segments | Product revenues transferred at a point in time | Correction | Product revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue   (85.0) (69.9)
Janus North America | Operating Segments | Service revenues transferred over time | Product revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue 122.4 102.8 86.8
Janus North America | Operating Segments | Service revenues transferred over time | Service revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue $ 122.0 96.5 83.2
Janus North America | Operating Segments | Service revenues transferred over time | As previously reported | Product revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue   0.0 0.0
Janus North America | Operating Segments | Service revenues transferred over time | As previously reported | Service revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue   114.3 100.1
Janus North America | Operating Segments | Service revenues transferred over time | Correction | Product revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue   102.8 86.8
Janus North America | Operating Segments | Service revenues transferred over time | Correction | Service revenues      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue   $ (17.8) $ (16.9)