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SHORT-TERM AND LONG-TERM DEBT (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt Instruments
Long-term debt consisted of the following (in thousands of dollars):
 
As of June 30, 2018
 
As of December 31, 2017
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
4.60% senior notes due 2045
$
1,000,000

 
$
1,035,950

 
$
1,000,000

 
$
1,089,000

3.75% senior notes due 2046
400,000

 
363,140

 
400,000

 
384,200

4.20% senior notes due 2047
400,000

 
390,800

 
400,000

 
410,800

British pound term loan
184,899

 
184,899

 
194,574

 
194,574

Euro term loan
128,514

 
128,514

 
131,956

 
131,956

Canadian dollar revolving credit facility
91,394

 
91,394

 
99,388

 
99,388

Capital lease obligations and other
58,593

 
58,593

 
84,274

 
84,274

Subtotal
2,263,400

 
2,253,290

 
2,310,192

 
2,394,192

Less current maturities
(30,172
)
 
(30,172
)
 
(38,709
)
 
(38,709
)
Debt issuance costs and discounts
(22,870
)
 
(22,870
)
 
(23,447
)
 
(23,447
)
Long-term debt (less current maturities)
$
2,210,358

 
$
2,200,248

 
$
2,248,036

 
$
2,332,036