XML 227 R76.htm IDEA: XBRL DOCUMENT v3.25.0.1
Accumulated Other Comprehensive Loss ("AOCL") - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive loss before income tax effect $ (105.6) $ (100.2)
Income tax effect 2.3 2.3
Accumulated other comprehensive loss (103.3) (97.9)
Defined benefit plan and other postretirement liabilities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive loss before income tax effect (107.0) (101.8)
Income tax effect 2.6 2.6
Unrealized gain (loss) on financial instruments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive loss before income tax effect 1.4 1.6
Income tax effect $ (0.3) $ (0.3)