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Fair Value Measurements: (Tables)
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Fair value measurements
(Millions)
 
June 30,
2020

 
December 31,
2019

Not Recorded at Fair Value in the Financial Statements: (a)
 
 
 
 
Debt, including current portion - Level 2:
 
 
 
 
   Included in current portion of long-term debt
 
$
766.4

 
$
500.0

   Included in liabilities subject to compromise
 
$
2,051.1

 
$
3,676.1



(a)
Recognized at carrying value of $6,499.3 million and $6,099.3 million in debt, including current portion, and liabilities subject to compromise and excluding unamortized debt issuance costs, in the accompanying consolidated balance sheets as of June 30, 2020 and December 31, 2019, respectively.