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Retirement Plans and Postretirement Benefits - (Tables)
 6 Months Ended
Jun. 30, 2025
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 Plans2025202420252024
Service cost$0.8 $0.6 $1.5 $1.3 
Interest cost3.0 3.0 5.9 5.9 
Expected return on plan assets(3.3)(3.9)(6.7)(7.9)
Amortization of actuarial loss0.2 — 0.4 0.1 
Net periodic cost $0.6 $(0.3)$1.2 $(0.6)

 Quarter Ended June 30,Six Months Ended June 30,
Other Postretirement Employee Benefit Plans2025202420252024
Service cost$— $0.1 $0.1 $0.1 
Interest cost0.6 0.7 1.2 1.3 
Amortization of actuarial gain(0.1)(0.1)(0.3)(0.1)
Net periodic cost$0.5 $0.6 $1.0 $1.3