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Pension and Postretirement Benefits (Components of Net Periodic Benefit) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Postretirement        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.0 $ 0.0 $ 0.0 $ 0.0
Interest cost 0.2 0.2 0.3 0.3
Expected return on plan assets 0.0 0.0 0.0 0.0
Amortization of prior service cost 0.0 (0.2) 0.0 (0.4)
Amortization of net loss (gain) (0.2) (0.2) (0.3) (0.4)
Settlement gain     0.0 0.0
Net periodic expense (benefit) 0.0 (0.2) 0.0 (0.5)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0.0 0.0 0.0 0.0
Interest cost 0.2 0.2 0.3 0.3
Expected return on plan assets 0.0 0.0 0.0 0.0
Amortization of net loss (gain) (0.2) (0.2) (0.3) (0.4)
Settlement gain     0.0 0.0
Amortization of prior service cost 0.0 (0.2) 0.0 (0.4)
Net periodic expense (benefit) 0.0 (0.2) 0.0 (0.5)
Pension        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.5 0.6 1.0 1.1
Interest cost 0.4 0.5 0.8 1.0
Expected return on plan assets (0.7) (0.8) (1.3) (1.6)
Amortization of prior service cost (0.2) (0.2) (0.4) (0.4)
Amortization of net loss (gain) 0.1 0.0 0.1 0.1
Settlement gain (0.1) 0.0    
Net periodic expense (benefit) 0.0 0.1 0.1 0.2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0.5 0.6 1.0 1.1
Interest cost 0.4 0.5 0.8 1.0
Expected return on plan assets (0.7) (0.8) (1.3) (1.6)
Amortization of net loss (gain) 0.1 0.0 0.1 0.1
Settlement gain (0.1) 0.0    
Amortization of prior service cost (0.2) (0.2) (0.4) (0.4)
Net periodic expense (benefit) $ 0.0 $ 0.1 $ 0.1 $ 0.2