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Financing Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Debt and Financing Obligations [Abstract]  
Schedule of Financing Obligations
 
December 31, 2017
December 31, 2016
Revolving credit facility (a)
—

—

Senior secured notes (b)
—

$297.6

Equipment financing obligations
$7.5

$7.3

 
$7.5

$304.9

    Less: Current portion of financing obligations
($4.2
)
($3.6
)
 
$3.3

$301.3