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Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule Of Long-Term Debt Instruments
The carrying value of our long-term debt as of December 31, 2017 and 2016 consisted of the following (in millions):
 
 
2017
 
2016
8.50% Senior notes due 2019
 
$
251.4

 
$
480.2

6.875% Senior notes due 2020
 
477.9

 
735.9

4.70% Senior notes due 2021
 
267.1

 
674.4

3.00% Exchangeable senior notes due 2024
 
635.7

 
604.3

4.50% Senior notes due 2024
 
619.3

 
618.6

8.00% Senior notes due 2024
 
337.9

 
—

5.20% Senior notes due 2025
 
663.6

 
662.8

7.20% Debentures due 2027
 
149.3

 
149.2

7.875% Senior notes due 2040
 
376.7

 
378.3

5.75% Senior notes due 2044
 
971.8

 
970.8

Total debt
 
4,750.7

 
5,274.5

Less current maturities(1)
 
—

 
(331.9
)
Total long-term debt
 
$
4,750.7

 
$
4,942.6



(1) 
In January 2017, we completed exchange offers to exchange our outstanding 8.50% senior notes due 2019, 6.875% senior notes due 2020 and 4.70% senior notes due 2021 for 8.00% senior notes due 2024 and cash. As of December 31, 2016, the aggregate amount of principal repurchased with cash, along with associated premiums, was classified as current maturities of long-term debt on our consolidated balance sheet.
Convertible Debt
As of December 31, 2017 and 2016, the 2024 Convertible Notes consist of the following (in millions):
Liability component:
 
2017
 
2016
Principal
 
$
849.5

 
$
849.5

Less: Unamortized debt discount and issuance costs
 
(213.8
)
 
(245.2
)
Net carrying amount
 
635.7

 
604.3

Equity component, net
 
$
220.0

 
$
220.0
Schedule of Extinguishment of Debt
The following table sets forth the total principal amounts repurchased as a result of the tender offers and redemption (in millions):
 
Aggregate Principal Amount Repurchased
 
Aggregate Repurchase Price(1)
8.50% Senior notes due 2019
$
237.6

 
$
256.8

6.875% Senior notes due 2020
256.6

 
277.1

4.70% Senior notes due 2021
156.2

 
159.3

Total
$
650.4

 
$
693.2


(1) 
Excludes accrued interest paid to holders of the repurchased senior notes.
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


Our tender offers and open market repurchases during the two-year period ended December 31, 2017 were as follows (in millions):

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.

Year Ended December 31, 2016
 
Aggregate Principal Amount Repurchased
 
Aggregate Repurchase Price (1)
8.50% Senior notes due 2019
$
62.0

 
$
55.7

6.875% Senior notes due 2020
219.2

 
181.5

4.70% Senior notes due 2021
817.0

 
609.0

4.50% Senior notes due 2024
1.7

 
.9

5.20% Senior notes due 2025
30.7

 
16.8

Total
$
1,130.6

 
$
863.9


(1) 
Excludes accrued interest paid to holders of the repurchased senior notes.
Aggregate Maturities Of Long-Term Debt
s

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 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
 
2017 Repurchases
 
Principal Outstanding at December 31, 2017(1)
 
2018 Tender Offers, Redemption and Debt Issuance
 
Remaining Principal
8.50% due 2019
$
500.0

 
$
(62.0
)
 
$
(145.8
)
 
$
(54.6
)
 
$
237.6

 
$
(237.6
)
 
$
—

6.875% due 2020
900.0

 
(219.2
)
 
(129.8
)
 
(100.1
)
 
450.9

 
(256.6
)
 
194.3

4.70% due 2021
1,500.0

 
(817.0
)
 
(373.9
)
 
(39.4
)
 
269.7

 
(156.2
)
 
113.5

3.00% due 2024
849.5

 
—

 
—

 
—

 
849.5

 
—

 
849.5

4.50% due 2024
625.0

 
(1.7
)
 
—

 
—

 
623.3

 
—

 
623.3

8.00% due 2024
—

 
—

 
332.0

 
—

 
332.0

 
—

 
332.0

5.20% due 2025
700.0

 
(30.7
)
 
—

 
—

 
669.3

 
—

 
669.3

7.75% due 2026
—

 
—

 
—

 
—

 
—

 
1,000.0

 
1,000.0

7.20% due 2027
150.0

 
—

 
—

 
—

 
150.0

 
—

 
150.0

7.875% due 2040
300.0

 
—

 
—

 
—

 
300.0

 
—

 
300.0

5.75% due 2044
1,025.0

 
(24.5
)
 
—

 
—

 
1,000.5

 
—

 
1,000.5

Total
$
6,549.5

 
$
(1,155.1
)
 
$
(317.5
)
 
$
(194.1
)
 
$
4,882.8

 
$
349.6

 
$
5,232.4


(1) 
The aggregate principal amount outstanding as of December 31, 2017 excludes net unamortized discounts and debt issuance costs of $132.1 million.