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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 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 net financial assets measured at fair value on a recurring basis as of December 31, 2016 and 2015 (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, 2016
 

 
 

 
 

 
 

Supplemental executive retirement plan assets
$
27.7

 
$
—

 
$
—

 
$
27.7

Total financial assets
27.7

 
—

 
—

 
27.7

Derivatives, net
—

 
(8.8
)
 
—

 
(8.8
)
Total financial liabilities
$
—

 
$
(8.8
)
 
$
—

 
$
(8.8
)
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 debt instruments as of December 31, 2016 and 2015 were as follows (in millions):
 
 
December 31, 2016
 
December 31, 2015
 
 
Carrying
Value
 
Estimated
  Fair
Value
 
Carrying
Value
 
Estimated
  Fair
Value
 
 
 
 
 
 
 
 
 
8.50% Senior notes due 2019
 
$
480.2

 
$
485.0

 
$
566.4

 
$
510.2

6.875% Senior notes due 2020
 
735.9

 
727.5

 
990.9

 
850.5

4.70% Senior notes due 2021
 
674.4

 
658.9

 
1,476.7

 
1,254.0

3.00% Exchangeable senior notes due 2024 (1)
 
604.3

 
874.7

 
—

 
—

4.50% Senior notes due 2024
 
618.6

 
536.0

 
619.7

 
417.4

5.20% Senior notes due 2025
 
662.8

 
582.3

 
692.5

 
505.2

7.20% Debentures due 2027
 
149.2

 
138.7

 
149.1

 
133.5

7.875% Senior notes due 2040
 
378.3

 
270.6

 
379.8

 
244.0

5.75% Senior notes due 2044
 
970.8

 
728.0

 
993.5

 
707.1

Total 
 
$
5,274.5

 
$
5,001.7

 
$
5,868.6

 
$
4,621.9



 (1)  
Our 2024 Convertible Notes were issued with a conversion feature. The 2024 Convertible Notes were separated into their liability and equity components on our consolidated balance sheet. The equity component was initially recorded to additional paid-in capital and as a debt discount, which will be amortized to interest expense. Excluding the unamortized discount, the carrying value of the 2024 Convertible Notes was $830.1 million as of December 31, 2016. See "Note 4 - Debt" for additional information on this issuance.