v3.26.1
Components of Net Periodic Benefit Cost
 6 Months Ended
Jun. 30, 2026
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
8.    Components of Net Periodic Benefit Cost
Three months ended
June 30,		Six months ended
June 30,
Pension Benefits2026202520262025
Service cost$1.1 $0.6 $4.7 $1.3 
Interest cost4.9 3.5 16.5 6.8 
Expected return on plan assets(5.4)(4.0)(14.7)(7.9)
Amortization of prior service benefit0.2 — 0.3 0.1 
Amortization of net loss0.7 1.5 2.5 2.9 
Net periodic benefit cost$1.5 $1.6 $9.3 $3.2 
Three months ended
June 30,		Six months ended
June 30,
Other Postretirement Benefits2026202520262025
Service cost$0.1 $0.1 $0.2 $0.1 
Interest cost(0.1)0.9 1.2 1.9 
Amortization of net (gain) loss(1.4)0.1 (1.1)0.3 
Net periodic benefit cost$(1.4)$1.1 $0.3 $2.3