FINANCING: (Tables)

12 Months Ended

Dec. 31, 2013

FINANCING:

Schedule of long-term debt

	Issuance		Face		As of December 31,
(in millions)	Date	Due Date	amount		2013		2012
1.763% Mitsui credit agreement	1999	2013	$	100	$	—	$	10.0
6.375% Senior unsecured notes	2005	2015	200		199.7		199.6
5.375% Senior unsecured notes	2010	2020	400		398.6		398.4
3.500% Senior unsecured notes	2012	2022	300		299.1		299.0
9.250% Yankee Bonds	1998	2028	125		51.1		51.1
7.500% Senior unsecured notes	2005/2006	2035	1,000		985.5		985.3
6.750% Senior unsecured notes	2010	2040	1,100		1,092.1		1,092.0
5.250% Senior unsecured notes	2012	2042	1,200		1,178.8		1,178.5
Total debt					4,204.9		4,213.9
Less, current portion					—		(10.0		)
Total long-term debt					$	4,204.9	$	4,203.9

Schedule of aggregate maturities of the outstanding borrowings

Aggregate maturities of the outstanding borrowings at December 31, 2013, are as follows:

Years	Principal Due (*)
	(in millions)
2014	—
2015	$	200.0
2016	—
2017	—
Thereafter	4,051.2
Total	$	4,251.2

(*)Total debt maturities do not include the debt discount valuation account of $46.3 million.