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Post-retirement benefits - Components of Net Periodic Benefit (Income) Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 28, 2025
Jun. 29, 2024
Jun. 28, 2025
Jun. 29, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans        
—Employer service cost $ 1.0 $ 1.0 $ 2.0 $ 2.0
—Interest cost 6.7 6.4 13.1 12.8
—Expected return on plan assets (6.0) (6.4) (11.7) (12.9)
—Net amortization of prior period losses (gains) (0.2) (0.6) (0.5) (1.2)
Net periodic benefit cost (income) 1.5 0.4 2.9 0.7
Cash Contributions 2.9 2.3 7.3 4.9
Pensions        
Defined Benefit Plans and Other Postretirement Benefit Plans        
—Employer service cost 1.0 1.0 2.0 2.0
—Interest cost 6.4 6.1 12.5 12.2
—Expected return on plan assets (6.0) (6.4) (11.7) (12.9)
—Net amortization of prior period losses (gains) 0.5 0.2 1.0 0.4
Net periodic benefit cost (income) 1.9 0.9 3.8 1.7
Cash Contributions 2.2 1.6 5.7 3.2
Other post-retirement benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans        
—Employer service cost 0.0 0.0 0.0 0.0
—Interest cost 0.3 0.3 0.6 0.6
—Expected return on plan assets 0.0 0.0 0.0 0.0
—Net amortization of prior period losses (gains) (0.7) (0.8) (1.5) (1.6)
Net periodic benefit cost (income) (0.4) (0.5) (0.9) (1.0)
Cash Contributions $ 0.7 $ 0.7 $ 1.6 $ 1.7