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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value Measurements
The following table presents, by level within the fair value hierarchy, certain of our financial assets and liabilities. The carrying values of short-term financial assets (advances to affiliate) that have variable interest rates, accounts receivable and accounts payable approximate fair value because of the short-term nature of these instruments. Therefore, these assets and liabilities are not presented in the following table.
 
 
 
 
 
 
 
Fair Value Measurements Using
 
 
Carrying
Amount
 
Fair Value
 
Quoted
Prices In
Active
Markets for
Identical
Assets
(Level  1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
 
(Millions)
Assets (liabilities) at September 30, 2018:
 
 
 
 
 
 
 
 
 
 
Measured on a recurring basis:
 
 
 
 
 
 
 
 
 
 
ARO Trust investments
 
$
156.8

 
$
156.8

 
$
156.8

 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
Additional disclosures:
 
 
 
 
 
 
 
 
 
 
Long-term debt, including current portion
 
(3,205.7
)
 
(3,621.6
)
 
—

 
(3,621.6
)
 
—

 
 
 
 
 
 
 
 
 
 
 
Assets (liabilities) at December 31, 2017:
 
 
 
 
 
 
 
 
 
 
Measured on a recurring basis:
 
 
 
 
 
 
 
 
 
 
ARO Trust investments
 
$
134.6

 
$
134.6

 
$
134.6

 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
Additional disclosures:
 
 
 
 
 
 
 
 
 
 
Long-term debt
 
(2,443.0
)
 
(3,103.3
)
 
—

 
(3,103.3
)
 
—