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Equity-Method Investments (Tables)
 12 Months Ended
Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Equity Method Investment Recorded in Consolidated Statements of Operations
The following amounts related to this equity-method investment were recorded in our Consolidated Statements of Operations (in millions):
Year Ended December 31,
 
2018
 
2017
 
2016
Asset impairments to write investment down to fair value
 
$
—

 
$
—

 
$
14.0

Our portion of the partnership’s operating losses
 
—

 
—

 
8.3

Non-cash interest expense related to the amortization of the discounted fair value of future equity contributions
 
—

 
—

 
0.2

Tax benefits and credits generated
 
—

 
—

 
28.5