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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2012
Debt Disclosure [Abstract]  
Principal amount, carrying amount, and interest expense of the notes
The following tables provide additional information regarding the Convertible Notes:
 
December 31,
2012
 
December 31,
2011
Principal amount
$
175.0

 
$
175.0

Less: unamortized issuance discount1
(19.7
)
 
(27.0
)
Carrying amount, net of discount
$
155.3

 
$
148.0

________________
1    The remaining unamortized issuance discount at December 31, 2012 will be amortized over the next 2.3 years assuming no early conversion.
 
See “Fair Values of Financial Assets and Liabilities - All Other Financial Assets and Liabilities” in Note 13 for information
relating to the estimated fair value of the Convertible Notes.
 
Year Ended December 31,
 
2012
 
2011
 
2010
Contractual coupon interest
$
7.9

 
$
8.4

 
$
6.0

Amortization of discount and deferred financing costs
8.5

 
7.8

 
5.3

Total interest expense1
$
16.4

 
$
16.2

 
$
11.3


____________
1 
A portion of the interest relating to the Convertible Notes is capitalized as Construction in progress.