v3.24.3
Post-retirement benefits - Components of Net Periodic Benefit (Income) Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Sep. 28, 2024
Sep. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans        
—Employer service cost $ 1.0 $ 1.0 $ 3.0 $ 2.9
—Interest cost 6.4 6.7 19.2 19.9
—Expected return on plan assets (6.5) (6.5) (19.4) (19.5)
—Net amortization of prior period losses (gains) (0.6) (0.9) (1.8) (2.6)
—Settlements and curtailments 0.1 0.0 0.1 0.0
Net periodic benefit cost 0.4 0.3 1.1 0.7
Cash Contributions 2.9 2.2 7.8 7.8
Pensions        
Defined Benefit Plans and Other Postretirement Benefit Plans        
—Employer service cost 1.0 1.0 3.0 2.9
—Interest cost 6.0 6.3 18.2 18.8
—Expected return on plan assets (6.5) (6.5) (19.4) (19.5)
—Net amortization of prior period losses (gains) 0.2 0.0 0.6 (0.1)
—Settlements and curtailments 0.1 0.0 0.1 0.0
Net periodic benefit cost 0.8 0.8 2.5 2.1
Cash Contributions 2.2 1.6 5.4 5.3
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 0.4 0.4 1.0 1.1
—Expected return on plan assets 0.0 0.0 0.0 0.0
—Net amortization of prior period losses (gains) (0.8) (0.9) (2.4) (2.5)
—Settlements and curtailments 0.0 0.0 0.0 0.0
Net periodic benefit cost (0.4) (0.5) (1.4) (1.4)
Cash Contributions $ 0.7 $ 0.6 $ 2.4 $ 2.5