v3.26.1
Retirement Plans and Postretirement Benefits - (Tables)
6 Months Ended
Jun. 30, 2026
Retirement Benefits [Abstract]  
Components of Net Periodic Cost of Pension and Other Postretirement Employee Benefit Plans
 Quarter Ended June 30,Six Months Ended June 30,
Pension Benefit Plans2026202520262025
Service cost$0.6 $0.8 $1.3 $1.5 
Interest cost2.8 3.0 5.6 5.9 
Expected return on plan assets(3.0)(3.3)(6.0)(6.7)
Amortization of actuarial loss0.9 0.2 1.8 0.4 
Net periodic cost $1.3 $0.6 $2.7 $1.2 

 Quarter Ended June 30,Six Months Ended June 30,
Other Postretirement Employee Benefit Plans2026202520262025
Service cost$— $— $0.1 $0.1 
Interest cost0.6 0.6 1.1 1.2 
Amortization of actuarial gain(0.1)(0.1)(0.3)(0.3)
Net periodic cost$0.5 $0.5 $0.9 $1.0