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Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Components of Long-Term Debt
Long-term debt is comprised of the following:
As of December 31,
 
2017

 
2016

10.75% senior secured notes due April 15, 2022 ($440.0 million face value less unamortized discount and fees of $10.4 million at December 31, 2017)
 
$
429.6

 
$
—

5.50% convertible senior notes due March 1, 2021 ($213.5 million face value less unamortized discount and fees of $27.2 million and $34.4 million at December 31, 2017 and 2016, respectively)
 
186.3

 
179.1

6.25% senior notes
 
—

 
94.7

Capital leases
 
7.5

 
10.1

Other debt
 
21.3

 
16.1

Total
 
644.7

 
300.0

Less – current maturities
 
10.8

 
106.0

Total long-term debt
 
$
633.9

 
$
194.0
Estimated Fair Values of Long-term Debt
Presented below are the estimated fair values of long-term debt as of December 31, 2017 and 2016.
As of December 31,
2017

 
2016

10.75% senior secured notes due April 15, 2022(a)
$
492.8

 
$
—

5.50% convertible senior notes due March 1, 2021
237.9

 
379.8

6.25% senior notes(b)
—

 
97.8

(a) Issued in April 2017
(b) Retired in April 2017
Schedule of Maturities of Long-term Debt, Including Capital Leases
Maturities of long-term debt, including capital leases, in each of the next five years and thereafter are as follows:
Year
Total

 
Long-Term Debt

 
Capital Leases

2018
$
10.8

 
$
8.2

 
$
2.6

2019
1.4

 
—

 
1.4

2020
2.3

 
0.9

 
1.4

2021
189.5

 
188.1

 
1.4

2022
432.3

 
431.5

 
0.8

Thereafter
8.4

 
8.4

 
—

Total
$
644.7

 
$
637.1

 
$
7.6
Schedule of Interest Expense
Interest expense related to the 2021 Notes(a) is comprised of the following:
Year ended December 31,
2017

 
2016

Contractual interest coupon
$
11.8

 
$
9.2

Amortization of debt discount
6.0

 
4.3

Amortization of debt issuance costs
1.2

 
1.0

Total
$
19.0

 
$
14.5

(a)Issued in 2016