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Debt (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule Of Long-Term Debt Instruments
The carrying value of our long-term debt as of December 31, 2018 and 2017 consisted of the following (in millions):
 
 
2018
 
2017
8.50% Senior notes due 2019(1)
 
$
—

 
$
251.4

6.875% Senior notes due 2020(1)
 
127.5

 
477.9

4.70% Senior notes due 2021(1)
 
112.7

 
267.1

3.00% Exchangeable senior notes due 2024(2)
 
666.8

 
635.7

4.50% Senior notes due 2024
 
619.8

 
619.3

8.00% Senior notes due 2024
 
337.0

 
337.9

5.20% Senior notes due 2025
 
664.4

 
663.6

7.75% Senior notes due 2026
 
985.0

 
—

7.20% Debentures due 2027
 
149.3

 
149.3

7.875% Senior notes due 2040
 
375.0

 
376.7

5.75% Senior notes due 2044
 
972.9

 
971.8

Total long-term debt
 
$
5,010.4

 
$
4,750.7



(1) 
The decline in the carrying value of our 8.50% senior notes due 2019, 6.875% senior notes due 2020 and our 4.70% senior notes due 2021 resulted from repurchases and redemptions during the first quarter of 2018 discussed below.

(2) 
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 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 $836.3 million and $834.0 million as of December 31, 2018 and 2017, respectively.
Convertible Debt
As of December 31, 2018 and 2017, the 2024 Convertible Notes consist of the following (in millions):
Liability component:
 
2018
 
2017
Principal
 
$
849.5

 
$
849.5

Less: Unamortized debt discount and issuance costs
 
(182.7
)
 
(213.8
)
Net carrying amount
 
666.8

 
635.7

Equity component, net
 
$
220.0

 
$
220.0
Schedule of Extinguishment of Debt
Our tender offers and open market repurchases during the two-year period ended December 31, 2018 were as follows (in millions):

Year Ended December 31, 2018
 
Aggregate Principal Amount Repurchased
 
Aggregate Repurchase Price(1)
8.50% Senior notes due 2019
$
237.6

 
$
256.8

6.875% Senior notes due 2020
328.0

 
354.7

4.70% Senior notes due 2021
156.2

 
159.7

Total
$
721.8

 
$
771.2


Year Ended December 31, 2017
 
Aggregate Principal Amount Repurchased
 
Aggregate Repurchase Price(1)
8.50% Senior notes due 2019
$
54.6

 
$
60.1

6.875% Senior notes due 2020
100.1

 
105.1

4.70% Senior notes due 2021
39.4

 
39.3

Total
$
194.1

 
$
204.5


(1) 
Excludes accrued interest paid to holders of the repurchased senior notes.
During 2017, we completed exchange offers to exchange our outstanding 2019 Notes, 2020 Notes and 2021 Notes for our 8% 2024 Notes and cash. The exchange offers resulted in the tender of $649.5 million aggregate principal amount of our outstanding notes that were settled and exchanged as follows (in millions):

 
Aggregate Principal Amount Repurchased
 
8% Senior Notes Due 2024 Consideration
 
Cash
Consideration
 
Total Consideration
8.50% Senior notes due 2019
$
145.8

 
$
81.6

 
$
81.7

 
$
163.3

6.875% Senior notes due 2020
129.8

 
69.3

 
69.4

 
138.7

4.70% Senior notes due 2021
373.9

 
181.1

 
181.4

 
362.5

Total
$
649.5

 
$
332.0

 
$
332.5

 
$
664.5
Aggregate Maturities Of Long-Term Debt
The descriptions of our senior notes above reflect the original principal amounts issued, which have subsequently changed as a result of our tenders, repurchases, exchanges, redemptions and new debt issuances such that the maturities of our debt were as follows (in millions):
Senior Notes
Original Principal
 
2016 Tenders, Repurchases and Equity Exchange
 
2017 Exchange Offers and Repurchases
 
2018 Tender Offers, Redemption and Debt Issuance
 
Remaining Principal
8.50% due 2019
$
500.0

 
$
(62.0
)
 
$
(200.4
)
 
$
(237.6
)
 
$
—

6.875% due 2020
900.0

 
(219.2
)
 
(229.9
)
 
(328.0
)
 
122.9

4.70% due 2021
1,500.0

 
(817.0
)
 
(413.3
)
 
(156.2
)
 
113.5

3.00% Exchangeable senior notes due 2024
849.5

 
—

 
—

 
—

 
849.5

4.50% due 2024
625.0

 
(1.7
)
 
—

 
—

 
623.3

8.00% due 2024
—

 
—

 
332.0

 
—

 
332.0

5.20% due 2025
700.0

 
(30.7
)
 
—

 
—

 
669.3

7.75% due 2026
—

 
—

 
—

 
1,000.0

 
1,000.0

7.20% due 2027
150.0

 
—

 
—

 
—

 
150.0

7.875% due 2040
300.0

 
—

 
—

 
—

 
300.0

5.75% due 2044
1,025.0

 
(24.5
)
 
—

 
—

 
1,000.5

Total
$
6,549.5

 
$
(1,155.1
)
 
$
(511.6
)
 
$
278.2

 
$
5,161.0