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Debt (Details Textuals) (USD $)
6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Letter of Credit [Member]
Jun. 30, 2014
Global Revolving Credit Facility [Member]
May 06, 2014
Unsecured Medium Term Notes Due September 2019 [Domain]
Jun. 30, 2014
U.S Commercial Paper, Long-Term [Member]
Dec. 31, 2013
U.S Commercial Paper, Long-Term [Member]
Jun. 30, 2014
Canadian Commerial Paper [Member]
Dec. 31, 2013
Canadian Commerial Paper [Member]
Jun. 30, 2014
Global Revolving Credit Facility Member
Jun. 30, 2014
Unsecured Us Notes Medium Term Notes Long Term [Member]
Jun. 30, 2014
Unsecured Us Obligations Principally Bank Term Loans Long Term [Member]
Jun. 30, 2014
Unsecured Foreign Obligations Long Term [Member]
Jun. 30, 2014
Capital Lease Obligations [Member]
Jun. 30, 2014
Unsecured Medium Term Notes Due 2019 [Member]
Feb. 25, 2014
Unsecured Medium Term Notes Due 2019 [Member]
Jun. 30, 2014
USCommercialPaperShortTerm [Member]
Dec. 31, 2013
USCommercialPaperShortTerm [Member]
Jun. 30, 2014
Short-term Debt [Member]
Debt Instrument [Line Items]                                      
Debt Instrument, Maturity Date Range, Start                     Mar. 01, 2015 Mar. 08, 2015 Mar. 01, 2015 May 24, 2014         Jun. 18, 2014
Debt Instrument, Maturity Date Range, End           Oct. 18, 2018   Oct. 18, 2018   Oct. 18, 2018 Feb. 25, 2025 Mar. 19, 2018 Sep. 06, 2016 Dec. 28, 2019         Jun. 18, 2014
Unamortized original issue discounts $ 8,800,000 $ 8,300,000                                  
Aggregate notional amount of interest rate swaps 600,000,000 400,000,000                                  
Line of Credit Facility [Abstract]                                      
Maximum borrowing capacity under global revolving credit facility     75,000,000 900,000,000                              
Number of lending institutions 12                                    
Letter of credit outstanding amount     0                                
Annual facility fees minimum 0.08                                    
Annual facility fees maximum 0.275                                    
Global revolving credit facility covenant terms, debt to consolidated tangible net worth ratio less than or equal to 300%                                    
Debt to consolidated tangible net worth ratio 194.00%                                    
Line of Credit Facility, Remaining Borrowing Capacity 380,000,000                                    
Debt (Textuals) [Abstract]                                      
Commercial paper classified as long term debt 375,949,000 498,236,000       375,949,000 486,939,000 0 11,297,000                    
Commercial Paper                                 144,000,000 0  
Face amount of unsecured medium-term notes issued         400,000,000                     350,000,000      
Repurchase price condition of notes                             101% of principal plus accrued and unpaid interest        
Total available proceeds under trade receivables purchase and sale program 175,000,000                                    
Number of days under trade trade receivables purchase and sale program 364 days                                    
Trade Receivables Purchase And Sale Program Amounts Outstanding 0 0                                  
Global Revolving Credit Facility Unused Capacity Commitment Fee Percent 12.50%                                    
Letters Of Credit And Surety Bonds Outstanding $ 310,700,000 $ 310,500,000