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Investments (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Equity Method Investments [Table Text Block]
The table below summarizes the book value of those investments and related financing receivables, which are reported in “Investments and other assets” in the consolidated balance sheets, and the related “Income from equity affiliates”:
 
 
 
Successor
Predecessor
 
Book Value at
 
Income from Equity Affiliates
 
December 31, 2018
 
December 31, 2017
 
Year Ended December 31, 2018
April 2 through December 31, 2017
January 1 through April 1, 2017
 
Year Ended December 31, 2016
 
(Dollars in millions)
Equity method investment and financing receivables related to Middlemount
$
45.0

 
$
82.1

 
$
(69.3
)
$
(48.6
)
$
(17.4
)
 
$
(22.6
)
Other equity method investments
0.9

 
1.7

 
1.2

(0.4
)
2.4

 
6.4

Total equity method investments and financing receivables related to Middlemount
$
45.9

 
$
83.8

 
$
(68.1
)
$
(49.0
)
$
(15.0
)
 
$
(16.2
)