v3.25.2
Business Segments (Revenue and Operating Profit by Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 28, 2025
Jun. 29, 2024
Jun. 28, 2025
Jun. 29, 2024
Dec. 28, 2024
Dec. 30, 2023
Segment Reporting Information [Line Items]            
Revenue $ 474.2 $ 425.2 $ 886.5 $ 820.1    
Cost of goods sold 250.2 242.0 467.7 455.5    
Operating Expenses 183.3 154.1 358.4 338.6    
Operating profit (loss) 40.7 29.1 60.4 26.0    
Interest expense, net 8.5 11.9 16.5 23.9    
Other Nonoperating Income (Expense) (1.4) (0.8) (2.9) (1.6)    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 33.6 18.0 46.8 3.7    
Depreciation and amortization     12.5 13.3    
Segment, Expenditure, Addition to Long-Lived Assets     11.0 8.1    
Total assets 1,808.5 1,796.3 1,808.5 1,796.3 $ 1,668.8  
Goodwill 432.6 425.8 432.6 425.8 424.6 $ 427.1
Active Group            
Segment Reporting Information [Line Items]            
Revenue 355.5 305.9 682.2 595.7    
Cost of goods sold 180.5 170.8 347.0 328.2    
Operating Expenses 110.3 93.0 212.4 189.2    
Operating profit (loss) 64.7 42.1 122.8 78.3    
Depreciation and amortization     3.1 3.3    
Segment, Expenditure, Addition to Long-Lived Assets     1.9 2.0    
Total assets 1,111.6 1,072.7 1,111.6 1,072.7 1,011.6  
Goodwill 322.2 316.5 322.2 316.5 315.4  
Work Group            
Segment Reporting Information [Line Items]            
Revenue 107.5 105.0 182.3 195.1    
Cost of goods sold 67.3 68.6 115.0 124.8    
Operating Expenses 19.9 21.8 39.9 43.0    
Operating profit (loss) 20.3 14.6 27.4 27.3    
Depreciation and amortization     0.2 0.2    
Segment, Expenditure, Addition to Long-Lived Assets     0.0 0.0    
Total assets 275.1 282.8 275.1 282.8 266.2  
Goodwill 61.4 60.2 61.4 60.2 60.2  
Other [Member]            
Segment Reporting Information [Line Items]            
Revenue 11.2 14.3 22.0 29.3    
Cost of goods sold 1.2 4.4 2.5 11.7    
Operating Expenses 1.9 1.7 3.9 5.2    
Operating profit (loss) 8.1 8.2 15.6 12.4    
Depreciation and amortization     0.6 0.7    
Segment, Expenditure, Addition to Long-Lived Assets     0.5 0.7    
Total assets 91.0 98.5 91.0 98.5 79.4  
Goodwill 49.0 49.1 49.0 49.1 49.0  
Corporate [Member]            
Segment Reporting Information [Line Items]            
Revenue 0.0 0.0 0.0 0.0    
Cost of goods sold 1.2 (1.8) 3.2 (9.2)    
Operating Expenses 51.2 37.6 102.2 101.2    
Operating profit (loss) (52.4) (35.8) (105.4) (92.0)    
Depreciation and amortization     8.6 9.1    
Segment, Expenditure, Addition to Long-Lived Assets     8.6 5.4    
Total assets $ 330.8 $ 342.3 $ 330.8 $ 342.3 $ 311.6