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Post-retirement benefits (Tables)
 6 Months Ended
Jun. 28, 2025
Postemployment Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Income for Pensions and Other Post-Retirement Benefits
The components of the net periodic benefit cost (income) for pensions and other post-retirement benefits were as follows:
Three months ended June 28, 2025Three months ended June 29, 2024
(dollars in millions)
Pensions
Other post-retirement benefits
Total
Pensions
Other post-retirement benefits
Total
Reported in operating income:
—Employer service cost$1.0 $— $1.0 $1.0 $— $1.0 
Reported outside of operating income:
—Interest cost6.4 0.3 6.7 6.1 0.3 6.4 
—Expected return on plan assets(6.0)— (6.0)(6.4)— (6.4)
—Net amortization of prior period losses (gains)0.5 (0.7)(0.2)0.2 (0.8)(0.6)
Net periodic benefit cost (income)$1.9 $(0.4)$1.5 $0.9 $(0.5)$0.4 
Cash Contributions$2.2 $0.7 $2.9 $1.6 $0.7 $2.3 

Six months ended June 28, 2025Six months ended June 29, 2024
(dollars in millions)
Pensions
Other post-retirement benefits
Total
Pensions
Other post-retirement benefits
Total
Reported in operating income:
—Employer service cost$2.0 $— $2.0 $2.0 $— $2.0 
Reported outside of operating income:
—Interest cost12.5 0.6 13.1 12.2 0.6 12.8 
—Expected return on plan assets(11.7)— (11.7)(12.9)— (12.9)
—Net amortization of prior period losses (gains)1.0 (1.5)(0.5)0.4 (1.6)(1.2)
Net periodic benefit cost (income)$3.8 $(0.9)$2.9 $1.7 $(1.0)$0.7 
Cash Contributions$5.7 $1.6 $7.3 $3.2 $1.7 $4.9