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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Net loss (gain) $ 12.7 $ 6.8 $ 7.2
Prior service cost (benefit) 0.0 0.6 (27.4)
Amortization of prior service (cost) benefit, including recognition due to curtailment 4.8 7.1 4.9
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Net loss (gain) 12.6 17.6  
Prior service cost (benefit) 0.0 0.5  
Amortization of net loss, including recognition due to settlement (6.6) (5.2)  
Amortization of prior service (cost) benefit, including recognition due to curtailment (0.1) (0.1)  
Total amount recognized in other comprehensive loss 5.9 12.8  
Net periodic benefit cost 5.7 0.9 3.5
Total recognized in net periodic benefit cost and other comprehensive loss 11.6 13.7  
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Net loss (gain) 0.1 (10.5)  
Prior service cost (benefit) 0.0 0.1  
Amortization of net loss, including recognition due to settlement (2.3) (4.0)  
Amortization of prior service (cost) benefit, including recognition due to curtailment 4.9 7.2  
Total amount recognized in other comprehensive loss 2.7 (7.2)  
Net periodic benefit cost 2.1 1.2 $ 4.9
Total recognized in net periodic benefit cost and other comprehensive loss $ 4.8 $ (6.0)