v3.26.1
Retirement Plans and Postretirement Benefits - Narrative (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Service Cost $ 0.6 $ 0.8
Interest cost 2.8 3.0
Expected return on plan assets (3.0) (3.3)
Defined Benefit Plan, Amortization of Gain (Loss) 0.9 0.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 1.3 0.6
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Service Cost 0.1 0.0
Interest cost 0.6 0.6
Defined Benefit Plan, Amortization of Gain (Loss) (0.1) (0.1)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 0.5 0.5
Other Postretirement Benefits Plan [Member] | Cost of Sales [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax 0.6 0.7
Other Postretirement Benefits Plan [Member] | Selling, general, and administrative expenses [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax $ 0.1 $ 0.1