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Debt (Tables)
6 Months Ended
Jun. 30, 2013
Debt Instrument [Line Items]  
Schedule of Long Term Debt Instruments
The following table provides details of the carrying value of debt as of the dates indicated (in millions):
Description
 
Maturity Date
 
June 30,
2013
 
December 31,
2012
Credit facility
 
August 22, 2016
 
$
70.6

 
$
134.0

4.875% senior notes
 
March 15, 2023
 
400.0

 

7.625% senior notes
 
February 1, 2017
 

 
150.0

New 4.0% Notes, $105.3 million principal amount
 
June 15, 2014
 
102.3

 
100.9

New 4.25% Notes, $97.0 million principal amount
 
December 15, 2014
 
93.3

 
92.1

Original 4.0% Notes
 
June 15, 2014
 
9.6

 
9.7

Original 4.25% Notes
 
December 15, 2014
 
3.0

 
3.0

Capital lease obligations, weighted average interest rate of 2.7%
 
In installments through March 2020
 
118.4

 
79.0

Notes payable for equipment and other debt, weighted average interest rate of 3.1%
 
In installments through May 2018
 
59.2

 
30.2

Total debt
 
$
856.4

 
$
598.9

Less current maturities
 
(49.9
)
 
(52.6
)
Long-term debt
 
$
806.5

 
$
546.3

Schedule of Interest Expense, Net
The following table provides details of interest expense, net, classified within continuing operations for the periods indicated (in millions):
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
Interest expense:
 
 
 
 
 
 
 
Contractual and other interest expense
$
9.2

 
$
7.1

 
$
16.8

 
$
13.5

Accretion of senior convertible note discount
1.3

 
1.2

 
2.6

 
2.4

Amortization of deferred financing costs and commitment fees
1.4

 
1.3

 
2.7

 
2.7

Total interest expense
$
11.9

 
$
9.6

 
$
22.1

 
$
18.6

Interest income
(0.1
)
 
(0.1
)
 
(0.2
)
 
(0.2
)
Interest expense, net
$
11.8

 
$
9.5

 
$
21.9

 
$
18.4

Total New Senior Convertible Notes [Member]
 
Debt Instrument [Line Items]  
Schedule of Convertible Notes, Carrying Amount Details
The carrying values of the debt and equity components of the New Convertible Notes as of the dates indicated are as follows (in millions):
 
June 30, 2013
 
December 31, 2012
 
New 4.0% Senior
Convertible Notes
 
New 4.25% Senior
Convertible Notes
 
New 4.0% Senior
Convertible Notes
 
New 4.25% Senior
Convertible Notes
Principal amount
$
105.3

 
$
97.0

 
$
105.3

 
$
97.0

Unamortized debt discount and financing costs
(3.0
)
 
(3.7
)
 
(4.4
)
 
(4.9
)
Net carrying amount of debt component
$
102.3

 
$
93.3

 
$
100.9

 
$
92.1

Carrying amount of equity component
$
8.9

 
$
8.5

 
$
8.9

 
$
8.5


See Note 2 - Earnings Per Share for details regarding the value of the premium over the principal amount of the New Convertible Notes.