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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2014
Fair Value Disclosures [Abstract]  
Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis
The following fair value hierarchy table categorizes information regarding our net financial assets measured at fair value on a recurring basis (in millions):
 
Quoted Prices in Active Markets for Identical Assets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 
Total
As of March 31, 2014
 
 
 

 
 

 
 

Supplemental executive retirement plan assets 
$
39.2

 
$

 
$

 
$
39.2

Derivatives, net 

 
8.8

 

 
8.8

Total financial assets
$
39.2

 
$
8.8

 
$

 
$
48.0

 
 
 
 
 
 
 
 
As of December 31, 2013
 
 
 

 
 

 
 

Supplemental executive retirement plan assets
$
37.7

 
$

 
$

 
$
37.7

Derivatives, net 

 
1.8

 

 
1.8

Total financial assets
$
37.7

 
$
1.8

 
$

 
$
39.5

Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments
The carrying values and estimated fair values of our long-term debt instruments were as follows (in millions):
 
March 31,
2014
 
December 31,
2013
 
Carrying Value  
 
Estimated Fair Value  
 
Carrying Value  
 
Estimated Fair Value  
4.70% Senior notes due 2021
$
1,477.9

 
$
1,614.8

 
$
1,477.2

 
$
1,596.9

6.875% Senior notes due 2020
1,020.7

 
1,076.6

 
1,024.8

 
1,086.7

3.25% Senior notes due 2016
996.9

 
1,043.3

 
996.5

 
1,045.8

8.50% Senior notes due 2019
596.4

 
632.5

 
600.5

 
635.8

7.875% Senior notes due 2040
382.2

 
427.3

 
382.6

 
410.5

7.20% Debentures due 2027
149.1

 
182.4

 
149.1

 
178.6

4.33% MARAD bonds, including current maturities, due 2016
71.2

 
71.6

 
78.9

 
79.7

4.65% MARAD bonds, including current maturities, due 2020
31.5

 
34.9

 
31.5

 
35.2

6.36% MARAD bonds, including current maturities, due 2015
25.3

 
26.7

 
25.3

 
27.1

Total
$
4,751.2

 
$
5,110.1

 
$
4,766.4

 
$
5,096.3