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FINANCING ARRANGEMENTS - Components of Short-term and Long-term Debt (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 1,407,054	$ 1,465,000
Less: Current maturities and short-term borrowing	(66,000)	(715,000)
Long-term debt	$ 1,341,054	$ 750,000
Line of Credit | Revolving credit facility | Senior Unsecured Revolving Credit Facility 2019 Term Loan
Debt Instrument [Line Items]
Average interest rate as of	3.68%	2.70%
Total debt	$ 66,000	$ 715,000
Senior Notes | Series A Notes
Debt Instrument [Line Items]
Average interest rate as of	3.97%	3.97%
Total debt	$ 175,000	$ 175,000
Senior Notes | Series B Notes
Debt Instrument [Line Items]
Average interest rate as of	4.26%	4.26%
Total debt	$ 150,000	$ 150,000
Senior Notes | Series C Notes
Debt Instrument [Line Items]
Average interest rate as of	4.60%	4.60%
Total debt	$ 175,000	$ 175,000
Secured Debt | Receivables securitization facility
Debt Instrument [Line Items]
Average interest rate as of	2.87%	2.00%
Total debt	$ 249,854	$ 250,000
Unsecured Debt | Senior Notes Due 2028
Debt Instrument [Line Items]
Average interest rate as of	4.20%
Total debt	$ 591,200	$ 0

X

- Definition

The average effective interest rate during the reporting period.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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