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Pension and Other Postretirement Benefits - Changes in Plan Assets & Benefit Obligation Recognized in OCI (pre-taxed) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Net (gain) loss $ (11.9) $ (10.1) $ (5.9)
Amortization of prior service benefit during the period 0.2 0.1 (1.2)
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Net (gain) loss (8.4) (6.9)  
Net loss (gain) transferred due to acquisition 0.0 (4.5)  
Prior service cost (benefit) 0.0 1.2  
Amortization of net loss, including recognition due to settlement (5.8) (6.0)  
Amortization of prior service benefit during the period 0.2 0.1  
Exchange rates (2.4) (1.1)  
Total amount recognized in other comprehensive income (loss) 0.0 (3.6)  
Net periodic benefit cost 8.9 9.4 (5.3)
Total recognized in net periodic benefit cost and other comprehensive income (loss) 8.9 5.8  
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Net (gain) loss (0.3) (4.8)  
Net loss (gain) transferred due to acquisition 0.0 (0.2)  
Prior service cost (benefit) 0.0 0.0  
Amortization of net loss, including recognition due to settlement (0.7) (0.2)  
Amortization of prior service benefit during the period 0.0 0.0  
Exchange rates 0.0 (0.1)  
Total amount recognized in other comprehensive income (loss) (0.4) 4.3  
Net periodic benefit cost 4.8 4.1 $ (5.8)
Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 4.4 $ 8.4