XML 63 R48.htm IDEA: XBRL DOCUMENT v3.25.2
Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 0.6 $ 0.7 $ 1.3 $ 1.3
Interest cost 3.5 3.2 6.8 6.7
Expected return on plan assets (4.0) (4.1) (7.9) (7.9)
Amortization of prior service benefit (cost) 0.0 0.0 0.1 0.1
Amortization of net loss 1.5 1.3 2.9 3.0
Net periodic benefit cost 1.6 1.1 3.2 3.2
Other Postretirement Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0.1 0.1 0.1 0.1
Interest cost 0.9 0.9 1.9 1.9
Amortization of prior service benefit (cost) 0.0 (0.1) 0.0 (0.1)
Amortization of net loss 0.1 0.3 0.3 0.3
Net periodic benefit cost $ 1.1 $ 1.2 $ 2.3 $ 2.2