Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Long-Term Debt

December 31 (add 000)	2018			2017
4.25% Senior Notes, due 2024	$	396,398		$	395,814
7% Debentures, due 2025		124,272			124,180
3.450% Senior Notes, due 2027		296,939			296,628
3.500% Senior Notes, due 2027		494,765			494,352
6.25% Senior Notes, due 2037		228,094			228,033
4.250% Senior Notes, due 2047		591,541			591,688
Floating Rate Senior Notes, due 2019, interest rate of 3.29% and 2.13% at December 31,   2018 and 2017, respectively		299,260			298,102
Floating Rate Senior Notes, due 2020, interest rate of 3.30% and 2.10% at December 31, 2018 and 2017, respectively		298,956			298,227
6.60% Senior Notes, due 2018		-			299,871
Trade Receivable Facility, interest rate of 3.07% at December 31, 2018		390,000			-
Other notes		256			308
Total		3,120,481			3,027,203
Less: current maturities		(390,042	)		(299,909	)
Long-term debt	$	2,730,439		$	2,727,294

Schedule of Principal Amount, Effective Interest Rate and Maturity Date for Corporation's Senior Notes

	Principal Amount (add 000)		Effective Interest Rate	Maturity Date
4.25% Senior Notes	$	400,000	4.25%	July 2, 2024
7% Debentures	$	125,000	7.12%	December 1, 2025
3.450% Senior Notes	$	300,000	3.47%	June 1, 2027
3.500% Senior Notes	$	500,000	3.53%	December 15, 2027
6.25% Senior Notes	$	230,000	6.45%	May 1, 2037
4.250% Senior Notes	$	600,000	4.27%	December 15, 2047
Floating Rate Senior Notes, due 2019	$	300,000	Three-month LIBOR + 0.50%	December 20, 2019
Floating Rate Senior Notes, due 2020	$	300,000	Three-month LIBOR + 0.65%	May 22, 2020

Schedule of Corporation's Long-Term Debt Maturities

The Company’s long-term debt maturities for the five years following December 31, 2018, and thereafter are:  

(add 000)
2019	$	390,042
2020		299,015
2021		65
2022		90
2023		299,260
Thereafter		2,132,009
Total	$	3,120,481