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Pension and Other Postretirement Benefits Pension Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Apr. 11, 2019
Defined Benefit Plan Disclosure [Line Items]    
Net benefit liabilities $ 249.6 $ 239.3
Net projected benefit obligations, current $ 2.9 19.2
Expected return on plan assets 6.48%  
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Net benefit liabilities $ 233.5 $ 202.1
Net projected benefit obligations, current 1.4  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 35.7  
Other Postretirement Benefits Plan    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 1.5