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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019
 
 
 

 
 

 
 

Supplemental executive retirement plan assets 
$
29.3

 
$
—

 
$
—

 
$
29.3

Total financial assets
$
29.3

 
$
—

 
$
—

 
$
29.3

Derivatives, net 
$
—

 
$
(6.9
)
 
$
—

 
$
(6.9
)
Total financial liabilities
$
—

 
$
(6.9
)
 
$
—

 
$
(6.9
)
 
 
 
 
 
 
 
 
As of December 31, 2018
 
 
 

 
 

 
 

Supplemental executive retirement plan assets
$
27.2

 
$
—

 
$
—

 
$
27.2

Total financial assets
$
27.2

 
$
—

 
$
—

 
$
27.2

Derivatives, net 
$
—

 
$
(10.7
)
 
$
—

 
$
(10.7
)
Total financial liabilities
$
—

 
$
(10.7
)
 
$
—

 
$
(10.7
)
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments
The carrying values and estimated fair values of our debt instruments were as follows (in millions):
 
March 31,
2019
 
December 31,
2018
 
Carrying Value  
 
Estimated Fair Value  
 
Carrying Value  
 
Estimated Fair Value  
6.875% senior notes due 2020
$
126.9

 
$
122.8

 
$
127.5

 
$
121.6

4.70% senior notes due 2021
112.9

 
108.5

 
112.7

 
101.8

3.00% exchangeable senior notes due 2024(1)
674.7

 
655.5

 
666.8

 
575.5

4.50% senior notes due 2024
620.0

 
476.0

 
619.8

 
405.2

8.00% senior notes due 2024
336.7

 
305.1

 
337.0

 
273.7

5.20% senior notes due 2025
664.6

 
517.7

 
664.4

 
443.9

7.75% senior notes due 2026
985.6

 
849.8

 
985.0

 
725.5

7.20% debentures due 2027
149.4

 
121.1

 
149.3

 
109.1

7.875% senior notes due 2040
374.6

 
238.2

 
375.0

 
223.2

5.75% senior notes due 2044
973.1

 
648.2

 
972.9

 
566.3

Total
$
5,018.5

 
$
4,042.9

 
$
5,010.4

 
$
3,545.8



(1) 
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 $836.9 million as of March 31, 2019.