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Pension and Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Net Pension and Postretirement Cost Net periodic pension and postretirement benefit cost for the Company’s defined pension and postretirement benefit plans for the three and six months ended June 30, 2025 and 2024 are set forth below (in millions):
Three Months Ended June 30,Six Months Ended June 30,
Pension benefits2025202420252024
Service cost$1.9 $2.1 $3.7 $4.2 
Interest cost6.7 6.9 13.3 13.9 
Expected return on plan assets(6.5)(7.7)(12.8)(15.4)
Amortization of net actuarial losses2.3 2.2 4.4 4.4 
Amortization of prior service cost0.4 0.4 0.8 0.7 
Net periodic pension cost$4.8 $3.9 $9.4 $7.8 

Three Months Ended June 30,Six Months Ended June 30,
Postretirement benefits2025202420252024
Service cost$— $— $— $0.1 
Interest cost0.3 0.4 0.7 0.8 
Amortization of net actuarial losses(0.1)— (0.1)— 
Amortization of prior service cost0.1 — 0.2 0.1 
Net periodic postretirement benefit cost$0.3 $0.4 $0.8 $1.0