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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 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 as of December 31, 2014 and 2013 (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 December 31, 2014
 

 
 

 
 

 
 

Supplemental executive retirement plan assets
$
43.2

 
$
—

 
$
—

 
$
43.2

Total financial assets
$
43.2

 
$
—

 
$
—

 
$
43.2

Derivatives, net
—

 
(26.3
)
 
—

 
(26.3
)
Total financial liabilities
$
—

 
$
(26.3
)
 
$
—

 
$
(26.3
)
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 debt instruments as of December 31, 2014 and 2013 were as follows (in millions):
 
 
December 31, 2014
 
December 31, 2013
 
 
Carrying
Value
 
Estimated
  Fair
Value
 
Carrying
Value
 
Estimated
  Fair
Value
 
 
 
 
 
 
 
 
 
4.70% Senior notes due 2021
 
$
1,479.9

 
$
1,505.3

 
$
1,477.2

 
$
1,596.9

6.875% Senior notes due 2020
 
1,008.2

 
1,008.5

 
1,024.8

 
1,086.7

3.25% Senior notes due 2016
 
998.0

 
1,018.3

 
996.5

 
1,045.8

4.50% Senior notes due 2024
 
624.2

 
602.0

 
—

 
—

5.75% Senior notes due 2044
 
622.3

 
615.8

 
—

 
—

8.50% Senior notes due 2019
 
583.8

 
611.8

 
600.5

 
635.8

7.875% Senior notes due 2040
 
381.2

 
363.8

 
382.6

 
410.5

7.20% Debentures due 2027
 
149.2

 
171.4

 
149.1

 
178.6

4.33% MARAD bonds, including current maturities, due 2016
 
46.6

 
46.8

 
78.9

 
79.7

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

 
—

 
25.3

 
27.1

4.65% MARAD bonds, including current maturities, due 2020
 
27.0

 
29.7

 
31.5

 
35.2

Total 
 
$
5,920.4

 
$
5,973.4

 
$
4,766.4

 
$
5,096.3