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FINANCING: (Tables)

12 Months Ended

Dec. 31, 2017

FINANCING:

Schedule of long-term debt

Long-term debt (in millions):

		Face amount			Issuance discount			Issuance costs			Carrying value as of December 31, 2017
5.375% Senior unsecured notes due 2020		$	400		$	(0.6	)	$	(0.6	)	$	398.8
3.500% Senior unsecured notes due 2022			300			(0.5	)		(0.8	)		298.7
3.875% Senior unsecured notes due 2025			500			(2.1	)		(2.0	)		495.9
9.250% Yankee Bonds due 2028			125			—			—			51.2
7.500% Senior unsecured notes due 2035			1,000			(13.2	)		(8.8	)		978.0
6.750% Senior unsecured notes due 2040			1,100			(7.4	)		(5.9	)		1,086.7
5.250% Senior unsecured notes due 2042			1,200			(19.8	)		(6.6	)		1,173.6
5.875% Senior unsecured notes due 2045			1,500			(16.9	)		(8.9	)		1,474.2
​	​	​	​	​	​	​	​	​	​	​	​	​	​
Total		$	6,125		$	(60.5	)	$	(33.6	)		5,957.1
​	​	​	​	​	​	​	​	​	​	​	​	​	​
Less, current portion												—
​	​	​	​	​	​	​	​	​	​	​	​	​	​
Total long-term debt											$	5,957.1
​	​	​	​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​	​	​	​

		Face amount			Issuance discount			Issuance costs			Carrying value as of December 31, 2016
5.375% Senior unsecured notes due 2020		$	400		$	(0.8	)	$	(0.9	)	$	398.3
3.500% Senior unsecured notes due 2022			300			(0.7	)		(0.9	)		298.4
3.875% Senior unsecured notes due 2025			500			(2.3	)		(2.2	)		495.5
9.250% Yankee Bonds due 2028			125			—			—			51.2
7.500% Senior unsecured notes due 2035			1,000			(13.6	)		(8.9	)		977.5
6.750% Senior unsecured notes due 2040			1,100			(7.5	)		(6.1	)		1,086.4
5.250% Senior unsecured notes due 2042			1,200			(20.2	)		(6.7	)		1,173.1
5.875% Senior unsecured notes due 2045			1,500			(17.1	)		(9.1	)		1,473.8
​	​	​	​	​	​	​	​	​	​	​	​	​	​
Total		$	6,125		$	(62.2	)	$	(34.8	)		5,954.2
​	​	​	​	​	​	​	​	​	​	​	​	​	​
Less, current portion												—
​	​	​	​	​	​	​	​	​	​	​	​	​	​
Total long-term debt											$	5,954.2
​	​	​	​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​	​	​	​

Schedule of aggregate maturities of the outstanding borrowings

Years		Principal Due(*)
		(in millions)
2018		$	—
2019			—
2020			400.0
2021			—
2022			300.0
Thereafter			5,351.2
​	​	​	​	​
Total		$	6,051.2
​	​	​	​	​
​	​	​	​	​

(*)           Total debt maturities do not include the debt discount valuation account of $94.1 million.

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