v3.26.1
Pension and Postretirement Benefits - Components of Net Periodic Benefit Expense (Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.4 $ 0.3 $ 0.8 $ 0.7
Interest cost 40.1 46.8 80.1 92.4
Expected return on plan assets (35.8) (48.5) (71.8) (95.6)
Amortization of prior service benefit (1.3) (1.2) (2.4) (2.3)
Recognized net actuarial gain 26.4 24.5 53.1 48.5
Net periodic pension and postretirement expense (income) 29.8 21.9 59.8 43.7
Pension Plans | U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.0 0.0 0.0 0.0
Interest cost 21.4 27.9 42.9 55.8
Expected return on plan assets (15.6) (26.3) (31.3) (52.6)
Amortization of prior service benefit (0.7) (0.7) (1.3) (1.3)
Recognized net actuarial gain 17.5 18.1 35.0 36.1
Net periodic pension and postretirement expense (income) 22.6 19.0 45.3 38.0
Pension Plans | International Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.4 0.3 0.8 0.7
Interest cost 18.7 18.9 37.2 36.6
Expected return on plan assets (20.2) (22.2) (40.5) (43.0)
Amortization of prior service benefit (0.6) (0.5) (1.1) (1.0)
Recognized net actuarial gain 8.9 6.4 18.1 12.4
Net periodic pension and postretirement expense (income) 7.2 2.9 14.5 5.7
Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.0 0.1 0.0 0.1
Interest cost 0.6 0.6 1.2 1.2
Expected return on plan assets 0.0 0.0 0.0 (0.1)
Amortization of prior service benefit 0.2 0.0 0.3 0.1
Recognized net actuarial gain (0.2) (0.6) (0.4) (1.1)
Net periodic pension and postretirement expense (income) $ 0.6 $ 0.1 $ 1.1 $ 0.2