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Debt (Details Textual)
6 Months Ended
Jun. 30, 2016
USD ($)
Institutions
Feb. 29, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 1,200,000,000.0    
Number of lending institutions | Institutions 12    
Annual facility fees, percentage 0.10%    
Ratio of debt to consolidated net worth 3    
Debt to consolidated tangible net worth ratio 214.00%    
Line of credit remaining capacity $ 424,700,000    
Total available proceeds under trade receivables purchase and sale program $ 175,000,000    
Number of days under trade receivables purchase and sale program 364 days    
Trade receivables borrowings $ 0   $ 0
Letters of credit and surety bonds outstanding 339,100,000   345,700,000
Fair value of total debt 5,310,000,000   5,060,000,000
U.S commercial paper [Member]      
Debt Instrument [Line Items]      
Commercial paper classified as long term debt 599,605,000   547,130,000
Global Revolving Credit Facility Member      
Debt Instrument [Line Items]      
Current maturities classified as long-term debt $ 351,900,000   $ 300,000,000
Unsecured Medium Term Notes Due March 2020 [Member]      
Debt Instrument [Line Items]      
Face amount of unsecured medium-term notes issued   $ 300,000,000  
Debt repurchase price, percentage 101.00%    
Letter of Credit [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 75,000,000    
Letter of credit outstanding amount $ 0    
Minimum [Member]      
Debt Instrument [Line Items]      
Annual facility fees, percentage 0.075%    
Maximum [Member]      
Debt Instrument [Line Items]      
Annual facility fees, percentage 0.25%