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Retirement Benefits (Tables)
6 Months Ended
Jun. 30, 2023
Retirement Benefits [Abstract]  
Schedule Of Defined Benefit Plans Disclosures
For the three month periods ended June 30, 2023 and 2022, 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
Three months ended June 30,Three months ended June 30,
 2023202220232022
Service cost - benefits earned during the year$1.6 $2.8 $0.1 $0.3 
Interest cost on benefits earned in prior years24.0 17.5 2.8 1.9 
Expected return on plan assets(25.6)(31.9)— — 
Amortization of prior service cost (credit)0.1 0.1 (0.3)(0.2)
Amortization of net actuarial loss14.4 15.9 1.5 3.3 
Settlement loss— 29.5 — — 
Total retirement benefit expense $14.5 $33.9 $4.1 $5.3 
For the six month periods ended June 30, 2023 and 2022, 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
Six months ended June 30,Six months ended June 30,
 2023202220232022
Service cost - benefits earned during the year$3.2 $6.0 $0.3 $0.5 
Interest cost on benefits earned in prior years48.0 35.3 5.5 3.9 
Expected return on plan assets(51.3)(65.0)— — 
Amortization of prior service cost (credit)0.2 0.2 (0.5)(0.5)
Amortization of net actuarial loss28.8 31.9 3.0 6.6 
Settlement loss— 29.5 — — 
Total retirement benefit expense $28.9 $37.9 $8.3 $10.5