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Pension and Other Postretirement Benefits Pension Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 4 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2021
Apr. 30, 2021
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]                
Net benefit liabilities $ 188.9 $ 188.9 $ 188.9 $ 208.9   $ 208.9 $ 299.5  
Net projected benefit obligations, current $ 2.8 2.8 $ 2.8 $ 4.9   4.9 $ 2.9  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 6.03%   6.03% 6.03% 6.70%   6.48%  
Unfunded obligation increase   (110.6) $ 9.2 $ 13.2        
Liability, Defined Benefit Plan, Noncurrent $ 186.1 186.1 186.1 204.0   $ 204.0 $ 296.6  
Employer contributions     22.5 2.4     11.5  
Defined Benefit Plan, Increase (Decrease) Due To Increase In Discount Rate 56.0              
Defined Benefit Plan, Increase (Decrease) Due To Return On Plan Assets 26.0              
Defined Benefit Plan, Expected Return (Loss) on Plan Assets     12.1 24.7 $ 27.1   36.5  
Savings Plan [Member]                
Defined Benefit Plan Disclosure [Line Items]                
Employer contributions             $ 8.8 $ 18.7
Employee match           100.00%    
Maximum                
Defined Benefit Plan Disclosure [Line Items]                
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets           6.26%    
Maximum | Savings Plan [Member]                
Defined Benefit Plan Disclosure [Line Items]                
Maximum percentage of eligible employee compensation to be matched by employer           5.00%    
Minimum                
Defined Benefit Plan Disclosure [Line Items]                
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets             6.03%  
Defined Benefit Plan, Underfunded Plan                
Defined Benefit Plan Disclosure [Line Items]                
Unfunded obligation increase           $ 20.0    
Defined Benefit Plan, Expected Return (Loss) on Plan Assets       7.1        
Reorganization, Chapter 11, Fresh-Start Adjustment                
Defined Benefit Plan Disclosure [Line Items]                
Liability, Defined Benefit Plan, Noncurrent 82.7 82.7 82.7          
Pension Benefits                
Defined Benefit Plan Disclosure [Line Items]                
Net benefit liabilities 174.1 174.1 174.1 193.3   193.3 $ 283.6  
Net projected benefit obligations, current 1.4 1.4 1.4 3.8   3.8 1.5  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year       3.8   3.8    
Liability, Defined Benefit Plan, Noncurrent $ 172.7 $ 172.7 172.7 189.5   189.5 282.1  
Employer contributions     $ 22.5 2.4     $ 11.5  
Other Postretirement Benefits Plan                
Defined Benefit Plan Disclosure [Line Items]                
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year       1.2   $ 1.2    
Supplemental Executive Retirement Plans [Member]                
Defined Benefit Plan Disclosure [Line Items]                
Unfunded obligation increase       $ 16.2