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Debt (Details Textual)
1 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
instution
Feb. 28, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 1,200,000,000.0 $ 1,200,000,000.0    
Number of lending institutions | instution   12    
Annual facility fees, percentage   10.00%    
Ratio of debt to consolidated net worth 3.00 3.00    
Debt to consolidated tangible net worth ratio 198.00% 198.00%    
Line of credit remaining capacity $ 339,000,000 $ 339,000,000    
Current Maturities Classified As Long Term Debt       $ 350,000,000
Total available proceeds under trade receivables purchase and sale program 175,000,000 $ 175,000,000    
Number of days under trade receivables purchase and sale program   364 days    
Trade receivables borrowings 0 $ 0   0
Letters of credit and surety bonds outstanding 358,000,000 358,000,000   354,000,000
Fair value of total debt 4,910,000,000 4,910,000,000   4,970,000,000
U.S commercial paper        
Debt Instrument [Line Items]        
Commercial paper classified as long term debt 724,618,000 724,618,000   342,480,000
Unsecured U.S. obligations        
Debt Instrument [Line Items]        
Unsecured U.S. obligations 50,000,000 $ 50,000,000   $ 50,000,000
Unsecured Medium Term Notes Due March 2020        
Debt Instrument [Line Items]        
Face amount of unsecured medium-term notes issued     $ 300,000,000  
Debt repurchase price, percentage   101.00%    
Asset-backed U.S. obligations        
Debt Instrument [Line Items]        
Proceeds from financing transactions 98,000,000      
Letter of Credit        
Debt Instrument [Line Items]        
Maximum borrowing capacity 75,000,000 $ 75,000,000    
Letter of credit outstanding amount $ 0 $ 0    
Minimum        
Debt Instrument [Line Items]        
Annual facility fees, percentage   7.50%    
Maximum        
Debt Instrument [Line Items]        
Annual facility fees, percentage   25.00%