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Debt (Tables)
12 Months Ended
Dec. 31, 2015
Debt Instruments [Abstract]  
Schedule Of Long-Term Debt Instruments
The carrying value of long-term debt as of December 31, 2015 and 2014 consisted of the following (in millions):
 
 
2015
 
2014
4.70% Senior notes due 2021
 
$
1,482.7

 
$
1,479.9

5.75% Senior notes due 2044
 
1,004.2

 
622.3

6.875% Senior notes due 2020
 
990.9

 
1,008.2

5.20% Senior notes due 2025
 
697.6

 

4.50% Senior notes due 2024
 
624.3

 
624.2

8.50% Senior notes due 2019
 
566.4

 
583.8

7.875% Senior notes due 2040
 
379.8

 
381.2

7.20% Debentures due 2027
 
149.2

 
149.2

3.25% Senior notes due 2016
 

 
998.0

4.33% MARAD bonds due 2016
 

 
46.6

4.65% MARAD bonds due 2020
 

 
27.0

Total debt
 
5,895.1

 
5,920.4

Less current maturities
 

 
(34.8
)
Total long-term debt
 
$
5,895.1

 
$
5,885.6

Aggregate Maturities Of Long-Term Debt
The aggregate maturities of our debt, excluding net unamortized premiums of $195.1 million, as of December 31, 2015 were as follows (in millions):
2016
 
$

2017
 

2018
 

2019
 
500.0

2020
 
900.0

Thereafter
 
4,300.0

Total
 
$
5,700.0