Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Schedule of Disaggregation of Revenue (Details)

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Revenue Recognition - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 30, 2024
Apr. 01, 2023
Disaggregation of Revenue [Line Items]    
Revenue $ 254.5 $ 251.9
Product revenues    
Disaggregation of Revenue [Line Items]    
Revenue 215.1 215.4
Service revenues    
Disaggregation of Revenue [Line Items]    
Revenue 39.4 36.5
Janus North America    
Disaggregation of Revenue [Line Items]    
Revenue   230.3
Operating Segments | Janus North America    
Disaggregation of Revenue [Line Items]    
Revenue 240.5 230.5
Operating Segments | Janus North America | Self Storage-New Construction    
Disaggregation of Revenue [Line Items]    
Revenue 104.2 64.6
Operating Segments | Janus North America | Self Storage-R3    
Disaggregation of Revenue [Line Items]    
Revenue 68.3 82.4
Operating Segments | Janus North America | Commercial and Others    
Disaggregation of Revenue [Line Items]    
Revenue 68.0 83.5
Operating Segments | Janus North America | Product revenues transferred at a point in time | Product revenues    
Disaggregation of Revenue [Line Items]    
Revenue 174.2 169.6
Operating Segments | Janus North America | Service revenues transferred over time | Product revenues    
Disaggregation of Revenue [Line Items]    
Revenue 32.7 32.9
Operating Segments | Janus North America | Service revenues transferred over time | Service revenues    
Disaggregation of Revenue [Line Items]    
Revenue 33.6 28.0
Operating Segments | Janus International    
Disaggregation of Revenue [Line Items]    
Revenue 14.7 21.6
Operating Segments | Janus International | Self Storage-New Construction    
Disaggregation of Revenue [Line Items]    
Revenue 12.4 18.6
Operating Segments | Janus International | Self Storage-R3    
Disaggregation of Revenue [Line Items]    
Revenue 2.3 3.0
Operating Segments | Janus International | Product revenues transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenue 8.9 13.1
Operating Segments | Janus International | Service revenues transferred over time    
Disaggregation of Revenue [Line Items]    
Revenue 5.8 8.5
Eliminations    
Disaggregation of Revenue [Line Items]    
Revenue $ (0.7) (0.2)
Eliminations | Janus North America    
Disaggregation of Revenue [Line Items]    
Revenue   $ (0.2)