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Pension and Other Postretirement Benefits (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
employees
Dec. 31, 2018
USD ($)
employees
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Amounts recognized in the consolidated balance sheets:          
Current liabilities $ (41.0) $ (38.7) $ (41.0) $ (38.7)  
Noncurrent liabilities (717.8) (829.9) (717.8) (829.9)  
Pension Plans, Defined Benefit [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Future pension contributions in next fiscal year 45.0   45.0    
Defined Benefit Plans, Estimated Future Employer Contributions, Year Two 45.0   45.0    
Defined Benefit Plans, Estimated Future Employer Contributions, Year Three 35.0   35.0    
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 142.6   142.6    
Change in benefit obligations:          
Benefit obligations at beginning of year     2,210.0 2,808.0  
Service cost     2.5 3.2 $ 2.8
Interest cost     85.9 94.5 108.2
Plan participants’ contributions     0.0 0.0  
Actuarial loss (gain)     206.5 (148.8)  
Amendments     0.0 0.0  
Benefits paid     (211.3) (268.1)  
Annuity settlement (615.6) (278.8) (615.6) (278.8)  
Termination benefits—Ashland Works     9.7 0.0 0.0
Medicare subsidy reimbursement received     0.0 0.0  
Benefit obligations at end of year 1,687.7 2,210.0 1,687.7 2,210.0 2,808.0
Change in plan assets:          
Fair value of plan assets at beginning of year     1,739.6 2,322.2  
Actual gain (loss) on plan assets     382.5 (87.0)  
Employer contributions     44.8 51.3  
Plan participants’ contributions     0.0 0.0  
Benefits paid     (211.3) (268.1)  
Annuity settlement     (615.6) (278.8)  
Medicare subsidy reimbursement received     0.0 0.0  
Fair value of plan assets at end of year 1,340.0 1,739.6 1,340.0 1,739.6 2,322.2
Funded status (347.7) (470.4) (347.7) (470.4)  
Amounts recognized in the consolidated balance sheets:          
Current liabilities (5.4) (1.2) (5.4) (1.2)  
Noncurrent liabilities (342.3) (469.2) (342.3) (469.2)  
Net amount recognized (347.7) (470.4) (347.7) (470.4)  
Amounts recognized in accumulated other comprehensive loss, before taxes:          
Actuarial loss (gain) 48.5 134.1 48.5 134.1  
Prior service cost (credit) 15.9 19.4 15.9 19.4  
Net amount recognized 64.4 153.5 64.4 153.5  
Aggregate accumulated benefit obligation $ 1,675.8 $ 2,188.6 1,675.8 2,188.6  
Number Of Retirees Beneficiaries Affected By Settlement | employees 4,250 5,400      
Gain (Loss) Due to Pension Settlement $ (26.9) $ (14.5) (26.9) (14.5) 0.0
Other Postretirement Benefit Plans, Defined Benefit [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 35.6   35.6    
Change in benefit obligations:          
Benefit obligations at beginning of year     398.2 448.5  
Service cost     3.5 4.5 4.7
Interest cost     16.4 15.6 17.3
Plan participants’ contributions     24.3 24.7  
Actuarial loss (gain)     16.2 (23.7)  
Amendments     0.0 (11.1)  
Benefits paid     (53.2) (62.6)  
Annuity settlement     0.0 0.0  
Termination benefits—Ashland Works     3.6 0.0 0.0
Medicare subsidy reimbursement received     2.1 2.3  
Benefit obligations at end of year 411.1 398.2 411.1 398.2 448.5
Change in plan assets:          
Fair value of plan assets at beginning of year     0.0 0.0  
Actual gain (loss) on plan assets     0.0 0.0  
Employer contributions     26.8 35.6  
Plan participants’ contributions     24.3 24.7  
Benefits paid     (53.2) (62.6)  
Annuity settlement     0.0 0.0  
Medicare subsidy reimbursement received     2.1 2.3  
Fair value of plan assets at end of year 0.0 0.0 0.0 0.0 0.0
Funded status (411.1) (398.2) (411.1) (398.2)  
Amounts recognized in the consolidated balance sheets:          
Current liabilities (35.6) (37.5) (35.6) (37.5)  
Noncurrent liabilities (375.5) (360.7) (375.5) (360.7)  
Net amount recognized (411.1) (398.2) (411.1) (398.2)  
Amounts recognized in accumulated other comprehensive loss, before taxes:          
Actuarial loss (gain) (15.5) (35.4) (15.5) (35.4)  
Prior service cost (credit) (69.2) (82.4) (69.2) (82.4)  
Net amount recognized $ (84.7) $ (117.8) (84.7) (117.8)  
Gain (Loss) Due to Pension Settlement     0.0 $ 0.0 $ 0.0
Defined Benefit Plan Mortality Table [Member] | Pension Plans, Defined Benefit [Member]          
Change in benefit obligations:          
Actuarial loss (gain)     31.0    
Defined Benefit Plan Discount Rate [Member] | Pension Plans, Defined Benefit [Member]          
Change in benefit obligations:          
Actuarial loss (gain)     182.4    
Defined Benefit Plan Discount Rate [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]          
Change in benefit obligations:          
Actuarial loss (gain)     33.7    
Defined Benefit Plan Asset Return [Member] | Pension Plans, Defined Benefit [Member]          
Change in benefit obligations:          
Actuarial loss (gain)     (272.8)    
Pension and OPEB Expense (Income) [Member]          
Change in benefit obligations:          
Termination benefits—Ashland Works     $ 13.3