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Pension and Other Postretirement Benefits- Health Care Cost Trends (Details) - Postretirement Benefits Other than Pensions
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Effect on total of service and interest cost components, increase $ 0.0
Effect on total of service and interest cost components, decrease 0.0
Effect on post-retirement benefit other than pension obligation, increase 0.2
Effect on post-retirement benefit other than pension obligation, decrease $ (0.2)