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Debt (Tables)
 12 Months Ended
Dec. 31, 2014
Debt Instruments [Abstract]  
Schedule Of Long-Term Debt Instruments
The carrying value of long-term debt as of December 31, 2014 and 2013 consisted of the following (in millions):
 
 
2014
 
2013
4.70% Senior notes due 2021
 
$
1,479.9

 
$
1,477.2

6.875% Senior notes due 2020
 
1,008.2

 
1,024.8

3.25% Senior notes due 2016
 
998.0

 
996.5

4.50% Senior notes due 2024
 
624.2

 
—

5.75% Senior notes due 2044
 
622.3

 
—

8.50% Senior notes due 2019
 
583.8

 
600.5

7.875% Senior notes due 2040
 
381.2

 
382.6

7.20% Debentures due 2027
 
149.2

 
149.1

4.33% MARAD bonds due 2016
 
46.6

 
78.9

6.36% MARAD bonds due 2015
 
—

 
25.3

4.65% MARAD bonds due 2020
 
27.0

 
31.5

Total debt
 
5,920.4

 
4,766.4

Less current maturities
 
(34.8
)
 
(47.5
)
Total long-term debt
 
$
5,885.6

 
$
4,718.9
Aggregate Maturities Of Long-Term Debt
The aggregate maturities of our debt, excluding net unamortized premiums of $247.9 million, as of December 31, 2014 were as follows (in millions):
2015
 
$
34.8

2016
 
1,019.7

2017
 
4.5

2018
 
4.5

2019
 
504.5

Thereafter
 
4,104.5

Total
 
$
5,672.5