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Pensions and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Pensions and Other Postretirement Benefits Pensions and Other Postretirement Benefits
The following table summarizes the components of net annual benefit cost (income):
(in Millions)Three Months Ended September 30,Nine Months Ended September 30,
PensionsOther BenefitsPensionsOther Benefits
20242023202420232024202320242023
Service cost$0.1 $0.6 $— $— $1.6 $2.0 $— $— 
Interest cost12.0 12.6 0.1 0.1 35.9 37.7 0.3 0.4 
Expected return on plan assets(11.1)(11.8)— — (33.5)(35.5)— — 
Amortization of prior service cost (credit)— 0.1 — — — 0.1 — — 
Amortization of net actuarial and other (gain) loss3.6 3.6 (0.3)(0.3)10.6 11.5 (0.7)(0.7)
Recognized (gain) loss due to curtailments, settlements, and other0.1 — — — 0.3 — — — 
Net periodic benefit cost (income)$4.7 $5.1 $(0.2)$(0.2)$14.9 $15.8 $(0.4)$(0.3)