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Long-term Debt (Tables)
12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
 
December 31,
 
2019
 
2018
 
(Dollars in millions)
6.000% Senior Secured Notes due March 2022
$
459.0

 
$
500.0

6.375% Senior Secured Notes due March 2025
500.0

 
500.0

Senior Secured Term Loan due 2025, net of original issue discount
392.1

 
395.9

Finance lease obligations
15.2

 
40.0

Less: Debt issuance costs
(55.5
)
 
(68.9
)
 
1,310.8

 
1,367.0

Less: Current portion of long-term debt
18.3

 
36.5

Long-term debt
$
1,292.5

 
$
1,330.5