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Pension and Other Postretirement Benefits (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
employees
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Amounts recognized in the consolidated balance sheets:          
Current liabilities $ (41.3)   $ (40.1) $ (41.3)  
Noncurrent liabilities (1,093.7)   (894.2) (1,093.7)  
Amounts recognized in accumulated other comprehensive loss, before taxes:          
Recognized Net Gain (Loss) Due to Pension Settlements     0.0 (25.0) $ 0.0
Pension and OPEB net corridor charge     0.0 43.1 131.2
Pension Plans, Defined Benefit [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Future pension contributions in next fiscal year     51.0    
Defined Benefit Plans, Estimated Future Employer Contributions, Year Two     35.0    
Defined Benefit Plans, Estimated Future Employer Contributions, Year Three     10.0    
Change in benefit obligations:          
Benefit obligations at beginning of year     2,874.8 3,247.4  
Service cost     2.8 3.0 2.2
Interest cost     108.2 120.4 130.0
Plan participants’ contributions     0.0 0.0  
Actuarial loss (gain)     91.0 45.1  
Amendments     0.0 8.4  
Settlements     0.0 (210.3)  
Benefits paid     (269.0) (339.1)  
Medicare subsidy reimbursement received     0.0 0.0  
Foreign currency exchange rate changes     0.2 (0.1)  
Benefit obligations at end of year 2,874.8   2,808.0 2,874.8 3,247.4
Change in plan assets:          
Fair value of plan assets at beginning of year     2,183.5 2,511.4  
Actual gain on plan assets     362.4 193.3  
Employer contributions     45.3 33.1  
Plan participants’ contributions     0.0 0.0  
Benefits paid     (269.0) (339.1)  
Annuity settlement     0.0 (215.2)  
Medicare subsidy reimbursement received     0.0 0.0  
Fair value of plan assets at end of year 2,183.5   2,322.2 2,183.5 2,511.4
Funded status (691.3)   (485.8) (691.3)  
Amounts recognized in the consolidated balance sheets:          
Current liabilities (1.3)   (1.3) (1.3)  
Noncurrent liabilities (690.0)   (484.5) (690.0)  
Net amount recognized (691.3)   (485.8) (691.3)  
Amounts recognized in accumulated other comprehensive loss, before taxes:          
Actuarial loss (gain) 209.7   77.6 209.7  
Prior service cost (credit) 27.9   23.2 27.9  
Net amount recognized 237.6   100.8 237.6  
Aggregate accumulated benefit obligation 2,826.6   2,767.1 2,826.6  
Number Of Retirees Beneficiaries Affected By Settlement | employees   10,000      
Recognized Net Gain (Loss) Due to Pension Settlements (25.0)     (25.0)  
Pension and OPEB net corridor charge 78.4   0.0 78.4 144.3
Other Postretirement Benefit Plans, Defined Benefit [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Expected Future Benefit Payments Net Of Prescription Drug Subsidy Receipts, Next Twelve Months     38.8    
Change in benefit obligations:          
Benefit obligations at beginning of year     443.7 488.6  
Service cost     4.7 4.9 7.1
Interest cost     17.3 19.9 22.5
Plan participants’ contributions     23.3 25.6  
Actuarial loss (gain)     27.1 (35.1)  
Amendments     (4.7) 0.0  
Settlements     0.0 0.0  
Benefits paid     (65.5) (65.6)  
Medicare subsidy reimbursement received     2.6 5.4  
Foreign currency exchange rate changes     0.0 0.0  
Benefit obligations at end of year 443.7   448.5 443.7 488.6
Change in plan assets:          
Fair value of plan assets at beginning of year     0.0 0.0  
Actual gain on plan assets     0.0 0.0  
Employer contributions     39.6 34.6  
Plan participants’ contributions     23.3 25.6  
Benefits paid     (65.5) (65.6)  
Annuity settlement     0.0 0.0  
Medicare subsidy reimbursement received     2.6 5.4  
Fair value of plan assets at end of year 0.0   0.0 0.0 0.0
Funded status (443.7)   (448.5) (443.7)  
Amounts recognized in the consolidated balance sheets:          
Current liabilities (40.0)   (38.8) (40.0)  
Noncurrent liabilities (403.7)   (409.7) (403.7)  
Net amount recognized (443.7)   (448.5) (443.7)  
Amounts recognized in accumulated other comprehensive loss, before taxes:          
Actuarial loss (gain) (44.4)   (13.0) (44.4)  
Prior service cost (credit) (138.7)   (84.9) (138.7)  
Net amount recognized $ (183.1)   (97.9) (183.1)  
Pension and OPEB net corridor charge     0.0 (35.3) $ (13.1)
Change in Assumptions for Defined Benefit Plans [Member] | Pension Plans, Defined Benefit [Member]          
Change in benefit obligations:          
Actuarial loss (gain)     (14.3) (33.8)  
Change in Assumptions for Defined Benefit Plans [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]          
Change in benefit obligations:          
Actuarial loss (gain)     $ (2.9) $ (4.5)