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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2016
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 financial assets and liabilities 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 June 30, 2016
 
 
 

 
 

 
 

Supplemental executive retirement plan assets 
$
33.3

 
$

 
$

 
$
33.3

Total financial assets
$
33.3

 
$

 
$

 
$
33.3

Derivatives, net 
$

 
$
(8.5
)
 
$

 
$
(8.5
)
Total financial liabilities
$

 
$
(8.5
)
 
$

 
$
(8.5
)
 
 
 
 
 
 
 
 
As of December 31, 2015
 
 
 

 
 

 
 

Supplemental executive retirement plan assets
$
33.1

 
$

 
$

 
$
33.1

Total financial assets
$
33.1

 
$

 
$

 
$
33.1

Derivatives, net 

 
(19.7
)
 

 
(19.7
)
Total financial liabilities
$

 
$
(19.7
)
 
$

 
$
(19.7
)
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):
 
June 30,
2016
 
December 31,
2015
 
Carrying Value  
 
Estimated Fair Value  
 
Carrying Value  
 
Estimated Fair Value  
8.50% Senior notes due 2019
$
506.5

 
$
467.0

 
$
566.4

 
$
510.2

6.875% Senior notes due 2020
829.1

 
747.6

 
990.9

 
850.5

4.70% Senior notes due 2021
767.1

 
653.4

 
1,476.7

 
1,254.0

4.50% Senior notes due 2024
618.3

 
427.0

 
619.7

 
417.4

5.20% Senior notes due 2025
662.4

 
465.2

 
692.5

 
505.2

7.20% Debentures due 2027
149.1

 
115.9

 
149.1

 
133.5

7.875% Senior notes due 2040
379.1

 
210.0

 
379.8

 
244.0

5.75% Senior notes due 2044
994.0

 
620.9

 
993.5

 
707.1

Total
$
4,905.6

 
$
3,707.0

 
$
5,868.6

 
$
4,621.9