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Debt (Tables)
12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
Schedule of debt
Long-term debt as of December 31, 2015 and 2014 consisted of the following obligations.

 
 
December 31,
(In millions)
 
2015
 
2014
Senior Notes, interest at 5.375% per annum, due November 2015
 
$

 
$
61.9

Convertible Senior Notes, interest at 5% per annum, due May 2017
 
333.5

 
345.0

Convertible Senior Notes, interest at 2% per annum, due April 2020
 
500.0

 
500.0

Convertible Junior Subordinated Debentures, interest at 9% per annum, due April 2063
 
389.5

 
389.5

Total debt
 
1,223.0

 
1,296.4

Less current portion of debt
 

 
(61.9
)
Total long-term debt
 
$
1,223.0

 
$
1,234.5



Interest Payments Made
Interest payments on our debt obligations existing during 2015 and 2014 appear below.
 
 
Years Ended December 31,
(In millions)
 
2015
 
2014
Senior Notes, interest at 5.375% per annum, due November 2015
 
$
3.3

 
$
3.6

Convertible Senior Notes, interest at 5% per annum, due May 2017
 
17.3

 
17.3

Convertible Senior Notes, interest at 2% per annum, due April 2020
 
10.0

 
10.0

Convertible Junior Subordinated Debentures, interest at 9% per annum, due April 2063
 
35.1

 
35.1

Total interest payments
 
$
65.7

 
$
66.0