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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Schedule of fair value, assets and liabilities measured on recurring basis
The following table presents, by level within the fair value hierarchy, certain of our financial assets and liabilities. The carrying values of cash, 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 December 31, 2014:
 
 
 
 
 
 
 
 
 
 
Measured on a recurring basis:
 
 
 
 
 
 
 
 
 
 
ARO Trust investments
 
$
47.5

 
$
47.5

 
$
47.5

 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
Additional disclosures:
 
 
 
 
 
 
 
 
 
 
Notes receivable
 
3.8

 
3.8

 
—

 
3.8

 
—

Long-term debt
 
(1,428.5
)
 
(1,506.4
)
 
—

 
(1,506.4
)
 
—

 
 
 
 
 
 
 
 
 
 
 
Assets (liabilities) at December 31, 2013:
 
 
 
 
 
 
 
 
 
 
Measured on a recurring basis:
 
 
 
 
 
 
 
 
 
 
ARO Trust investments
 
$
32.7

 
$
32.7

 
$
32.7

 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
Additional disclosures:
 
 
 
 
 
 
 
 
 
 
Notes receivable
 
6.3

 
6.3

 
—

 
6.3

 
—

Long-term debt
 
(1,428.4
)
 
(1,512.9
)
 
—

 
(1,512.9
)
 
—