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Debt (Details Textuals) (USD $)
3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Letter of Credit [Member]
Mar. 31, 2013
Global Revolving Credit Facility [Member]
Mar. 31, 2013
U.S Commercial Paper, Long-Term [Member]
Dec. 31, 2012
U.S Commercial Paper, Long-Term [Member]
Mar. 31, 2013
Canadian Commerial Paper [Member]
Dec. 31, 2012
Canadian Commerial Paper [Member]
Mar. 31, 2013
Global Revolving Credit Facility Member
Mar. 31, 2013
350 million unsecured medium-term notes due March 2017 [Member]
Mar. 31, 2013
Unsecured Us Notes Medium Term Notes Long Term [Member]
Mar. 31, 2013
Unsecured Us Obligations Principally Bank Term Loans Long Term [Member]
Mar. 31, 2013
Unsecured Foreign Obligations Long Term [Member]
Mar. 31, 2013
Capital Lease Obligations [Member]
Mar. 31, 2013
Unsecured Medium Term Notes Due 2019 [Member]
Feb. 19, 2013
Unsecured Medium Term Notes Due 2019 [Member]
Mar. 31, 2013
Short-term Debt [Member]
Debt Instrument [Line Items]                                  
Debt Instrument, Maturity Date Range, Start                     Mar. 01, 2014 Mar. 08, 2015 Sep. 06, 2014 Apr. 01, 2013     Apr. 23, 2013
Debt Instrument, Maturity Date Range, End         Jun. 08, 2016   Jun. 08, 2016   Jun. 08, 2016   Feb. 25, 2025 Mar. 19, 2019 Sep. 06, 2016 Dec. 28, 2018     Jun. 18, 2013
Unamortized original issue discounts $ 8,700,000 $ 8,800,000                              
Notional amount of the executed interest rate swap designated as a fair value hedge 300,000,000 550,000,000                              
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 10.0                                
Annual facility fees maximum 32.5                                
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 180.00%                                
Debt (Textuals) [Abstract]                                  
Commercial paper classified as long term debt 465,803,000 353,090,000     457,942,000 329,925,000 7,861,000 23,165,000                  
Face amount of unsecured medium-term notes issued                               250,000,000  
Repurchase price condition of notes                   101% of principal plus accrued and unpaid interest         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 15.0                                
Letters Of Credit And Surety Bonds Outstanding $ 293,900,000 $ 294,100,000