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Pension and Other Postretirement Benefits (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
employees
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Amounts recognized in the consolidated balance sheets:          
Current liabilities $ (38.7)   $ (38.7) $ (40.1)  
Noncurrent liabilities (829.9)   (829.9) (894.2)  
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 50.0   50.0    
Defined Benefit Plans, Estimated Future Employer Contributions, Year Three 50.0   50.0    
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 216.5   216.5    
Change in benefit obligations:          
Benefit obligations at beginning of year     2,808.0 2,874.8  
Service cost     3.2 2.8 $ 3.0
Interest cost     94.5 108.2 120.4
Plan participants’ contributions     0.0 0.0  
Actuarial loss (gain)     (148.8) 91.0  
Amendments     0.0 0.0  
Benefits paid     (268.1) (269.0)  
Annuity settlement (278.8)   (278.8) 0.0  
Medicare subsidy reimbursement received     0.0 0.0  
Foreign currency exchange rate changes     0.0 0.2  
Benefit obligations at end of year 2,210.0 $ 2,874.8 2,210.0 2,808.0 2,874.8
Change in plan assets:          
Fair value of plan assets at beginning of year     2,322.2 2,183.5  
Actual gain (loss) on plan assets     (87.0) 362.4  
Employer contributions     51.3 45.3  
Plan participants’ contributions     0.0 0.0  
Benefits paid     (268.1) (269.0)  
Annuity settlement     (278.8) 0.0  
Medicare subsidy reimbursement received     0.0 0.0  
Fair value of plan assets at end of year 1,739.6 2,183.5 1,739.6 2,322.2 2,183.5
Funded status (470.4)   (470.4) (485.8)  
Amounts recognized in the consolidated balance sheets:          
Current liabilities (1.2)   (1.2) (1.3)  
Noncurrent liabilities (469.2)   (469.2) (484.5)  
Net amount recognized (470.4)   (470.4) (485.8)  
Amounts recognized in accumulated other comprehensive loss, before taxes:          
Actuarial loss (gain) 134.1   134.1 77.6  
Prior service cost (credit) 19.4   19.4 23.2  
Net amount recognized 153.5   153.5 100.8  
Aggregate accumulated benefit obligation $ 2,188.6   2,188.6 2,767.1  
Number Of Retirees Beneficiaries Affected By Settlement | employees 5,400        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement $ (14.5) (25.0) (14.5) 0.0 (29.9)
Other Postretirement Benefit Plans, Defined Benefit [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 37.5   37.5    
Change in benefit obligations:          
Benefit obligations at beginning of year     448.5 443.7  
Service cost     4.5 4.7 4.9
Interest cost     15.6 17.3 19.9
Plan participants’ contributions     24.7 23.3  
Actuarial loss (gain)     (23.7) 27.1  
Amendments     (11.1) (4.7)  
Benefits paid     (62.6) (65.5)  
Annuity settlement     0.0 0.0  
Medicare subsidy reimbursement received     2.3 2.6  
Foreign currency exchange rate changes     0.0 0.0  
Benefit obligations at end of year 398.2 443.7 398.2 448.5 443.7
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     35.6 39.6  
Plan participants’ contributions     24.7 23.3  
Benefits paid     (62.6) (65.5)  
Annuity settlement     0.0 0.0  
Medicare subsidy reimbursement received     2.3 2.6  
Fair value of plan assets at end of year 0.0 $ 0.0 0.0 0.0 0.0
Funded status (398.2)   (398.2) (448.5)  
Amounts recognized in the consolidated balance sheets:          
Current liabilities (37.5)   (37.5) (38.8)  
Noncurrent liabilities (360.7)   (360.7) (409.7)  
Net amount recognized (398.2)   (398.2) (448.5)  
Amounts recognized in accumulated other comprehensive loss, before taxes:          
Actuarial loss (gain) (35.4)   (35.4) (13.0)  
Prior service cost (credit) (82.4)   (82.4) (84.9)  
Net amount recognized $ (117.8)   (117.8) (97.9)  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement     0.0 $ 0.0 $ 0.0
Change In Assumptions For Pension Plans Return Rate [Member] | Pension Plans, Defined Benefit [Member]          
Change in benefit obligations:          
Actuarial loss (gain)     235.8    
Change In Assumptions For Pension Plans Discount Rate [Member] | Pension Plans, Defined Benefit [Member]          
Change in benefit obligations:          
Actuarial loss (gain)     (154.6)    
Change in Assumptions for Defined Benefit Plans [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]          
Change in benefit obligations:          
Actuarial loss (gain)     $ (27.7)