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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2018
 
 
 

 
 

 
 

Supplemental executive retirement plan assets 
$
30.5

 
$
—

 
$
—

 
$
30.5

Total financial assets
$
30.5

 
$
—

 
$
—

 
$
30.5

Derivatives, net
$
—

 
$
(6.5
)
 
$
—

 
$
(6.5
)
Total financial liabilities
$
—

 
$
(6.5
)
 
$
—

 
$
(6.5
)
 
 
 
 
 
 
 
 
As of December 31, 2017
 
 
 

 
 

 
 

Supplemental executive retirement plan assets
$
30.9

 
$
—

 
$
—

 
$
30.9

Derivatives, net 
—

 
6.8

 
—

 
6.8

Total financial assets
$
30.9

 
$
6.8

 
$
—

 
$
37.7
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,
2018
 
December 31,
2017
 
Carrying Value  
 
Estimated Fair Value  
 
Carrying Value  
 
Estimated Fair Value  
8.50% Senior notes due 2019(1)
$
—

 
$
—

 
$
251.4

 
$
252.9

6.875% Senior notes due 2020(2)
128.9

 
128.3

 
477.9

 
473.1

4.70% Senior notes due 2021(2)
112.6

 
110.7

 
267.1

 
265.3

3.00% Exchangeable senior notes due 2024(3)
651.1

 
793.2

 
635.7

 
757.1

4.50% Senior notes due 2024
619.5

 
516.5

 
619.3

 
527.1

8.00% Senior notes due 2024
337.4

 
334.2

 
337.9

 
333.8

5.20% Senior notes due 2025
664.0

 
557.7

 
663.6

 
571.4

7.75% Senior notes due 2026
983.9

 
947.6

 
—

 
—

7.20% Debentures due 2027
149.3

 
136.9

 
149.3

 
141.9

7.875% Senior notes due 2040
375.9

 
270.6

 
376.7

 
258.8

5.75% Senior notes due 2044
972.3

 
709.5

 
971.8

 
690.4

Total
$
4,994.9

 
$
4,505.2

 
$
4,750.7

 
$
4,271.8



(1) 
Our senior notes due 2019 were redeemed in full in February 2018. See "Note 7 - Debt" for additional information.

(2) 
The reduction in carrying value of our seniors notes due 2020 and senior notes due 2021 was attributable to repurchases and redemptions during the first quarter of 2018.

(3)  
Our exchangeable senior notes due 2024 (the "2024 Convertible Notes") were issued with a conversion feature. The 2024 Convertible Notes were separated into their liability and equity components on our condensed consolidated balance sheet. The equity component was initially recorded to additional paid-in capital and as a debt discount that will be amortized to interest expense over the life of the instrument. Excluding the unamortized discount, the carrying value of the 2024 Convertible Notes was $835.1 million and $834.0 million as of June 30, 2018 and December 31, 2017, respectively.