XML 99 R82.htm IDEA: XBRL DOCUMENT v3.20.4
Pension and Other Postretirement Benefits Pension Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Apr. 11, 2019
Defined Benefit Plan Disclosure [Line Items]      
Net benefit liabilities $ 299.5 $ 249.6 $ 239.3
Net projected benefit obligations, current $ 2.9 $ 2.9 19.2
Expected return on plan assets 6.03% 6.48%  
Unfunded obligation increase $ 49.9    
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net benefit liabilities 283.6 $ 233.5 $ 202.1
Net projected benefit obligations, current 1.5 $ 1.4  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 39.8    
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 1.4