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Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Schedule Of Defined Benefit Plans Disclosures
For the quarters ended June 30, 2024 and July 2, 2023, the components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following (in millions): 
Pension BenefitsOther Postretirement Benefits
Quarter endedQuarter ended
 June 30, 2024July 2, 2023June 30, 2024July 2, 2023
Service cost - benefits earned during the year$1.4 $1.6 $0.1 $0.1 
Interest cost on benefits earned in prior years4.1 24.0 2.6 2.8 
Expected return on plan assets(4.1)(25.6)— — 
Amortization of prior service cost (credit)— 0.1 (0.2)(0.3)
Amortization of net actuarial loss— — 1.3 1.5 
Total retirement benefit expense $1.4 $0.1 $3.8 $4.1 
For the year-to-date periods ended June 30, 2024 and July 2, 2023, the components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following (in millions): 
Pension BenefitsOther Postretirement Benefits
Year-to-date period endedYear-to-date period ended
 June 30, 2024July 2, 2023June 30, 2024July 2, 2023
Service cost - benefits earned during the year$2.9 $3.2 $0.2 $0.3 
Interest cost on benefits earned in prior years8.2 48.0 5.1 5.5 
Expected return on plan assets(8.2)(51.3)— — 
Amortization of prior service cost (credit)0.1 0.2 (0.4)(0.5)
Amortization of net actuarial loss— — 2.6 3.0 
Total retirement benefit expense $3.0 $0.1 $7.5 $8.3