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Retirement Plans (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2013
property
Dec. 31, 2012
Dec. 31, 2011
property
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2012
Pension Benefits [Member]
Sep. 30, 2012
Pension Benefits [Member]
Dec. 31, 2013
Pension Benefits [Member]
property
Dec. 31, 2012
Pension Benefits [Member]
Dec. 31, 2011
Pension Benefits [Member]
Dec. 31, 2013
Postretirement Benefits Other Than Pensions (OPEB) [Member]
Dec. 31, 2012
Postretirement Benefits Other Than Pensions (OPEB) [Member]
Dec. 31, 2013
Postretirement Benefits Other Than Pensions (OPEB) [Member]
Minimum [Member]
Dec. 31, 2012
Postretirement Benefits Other Than Pensions (OPEB) [Member]
Minimum [Member]
Dec. 31, 2011
Postretirement Benefits Other Than Pensions (OPEB) [Member]
Minimum [Member]
Dec. 31, 2013
Postretirement Benefits Other Than Pensions (OPEB) [Member]
Maximum [Member]
Dec. 31, 2012
Postretirement Benefits Other Than Pensions (OPEB) [Member]
Maximum [Member]
Dec. 31, 2011
Postretirement Benefits Other Than Pensions (OPEB) [Member]
Maximum [Member]
Dec. 31, 2013
2013 Pension Real Estate Contributions [Member]
Dec. 31, 2013
2011 Pension Real Estate Contributions [Member]
Dec. 31, 2013
Equity Securities [Member]
Dec. 31, 2012
Equity Securities [Member]
Dec. 31, 2013
Equity Securities [Member]
Minimum [Member]
Dec. 31, 2013
Equity Securities [Member]
Maximum [Member]
Dec. 31, 2013
Alternative Investments [Member]
Dec. 31, 2012
Alternative Investments [Member]
Dec. 31, 2013
Alternative Investments [Member]
Minimum [Member]
Dec. 31, 2013
Alternative Investments [Member]
Maximum [Member]
Dec. 31, 2013
Debt Securities [Member]
Dec. 31, 2012
Debt Securities [Member]
Dec. 31, 2013
Debt Securities [Member]
Minimum [Member]
Dec. 31, 2013
Debt Securities [Member]
Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                                                                    
Discount rate - used at year end to value obligation (in hundredths)               4.00%   4.90% 4.00% 4.50%     4.90% 4.00% 4.50% 5.20% 4.20% 4.75%                            
Weighted average asset allocation (in hundreths)               100.00%   100.00% 100.00%                       42.00% 43.00% 35.00% 55.00% 13.00% 14.00% 5.00% 15.00% 44.00% 40.00% 35.00% 55.00%
Expected long-term rate of return on plan assets (in hundredths)                   8.00% 7.75% 8.00%     3.00% 3.00% 3.00% 4.00% 4.00% 6.00%                            
Expected Long Term Rate Of Return On Plan Assets In Future Year In Hundreths     7.75%                                                              
Lump sum pension payments                   $ 164,600,000                                                
Settlement threshold                   125,400,000                                                
Pension settlement costs (3,900,000) (40,300,000) (44,163,000)             (44,163,000)                                                
Capitalization of pension and OPEB expense related to engineering and plant construction     19,200,000 15,800,000 10,200,000                                                          
Estimated Pension And OPEB Expense           65,000,000 85,000,000                                                      
Pension and other postretirement benefit expenses     37,243,000 28,087,000 23,897,000                                                          
Number of properties contributed     4   4         4                                                
Contribution of Property     23,422,000   58,100,000         23,400,000   58,100,000                                            
Lease term of contributed property     15 years   15 years         15 years                                                
Pension Building Contribution Aggregate Annual Rent                                         2,100,000 5,800,000                        
Pension Building Contribution Minimum Lease Payments Sale Leaseback Transactions 107,102,000   107,102,000                                                              
Contributions to pension plan                   62,290,000 28,598,000 76,700,000 12,528,000 11,403,000                                        
Cash contributions to pension plan               10,300,000 18,300,000 38,900,000 28,600,000 18,600,000                                            
Accumulated benefit obligation 1,560,000,000   1,560,000,000 1,793,800,000                                                            
Annual rate of increase in the per-capita cost of covered medical benefits (in hundredths)                         7.50%                                          
Annual rate of increase in the per-capita cost of covered medical benefits in 2019 (in hundredths)                         5.00%                                          
Effect on total of service and interest cost components, 1 percentage point increase                         1,100,000                                          
Effect on postretirement benefit obligation, 1 percentage point increase                         14,800,000                                          
Effect on total of service and interest cost components, 1 percentage point decrease                         (1,000,000)                                          
Effect on postretirement benefit obligation, 1 percentage point decrease                         (13,800,000)                                          
401 (k) Savings Plan employer contributions     $ 20,600,000 $ 23,000,000 $ 22,200,000