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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2014
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.
 
 
 
 
 
 
 
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 March 31, 2014:
 
 
 
 
 
 
 
 
 
 
Measured on a recurring basis:
 
 
 
 
 
 
 
 
 
 
ARO Trust investments
 
$
45.0

 
$
45.0

 
$
45.0

 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
Additional disclosures:
 
 
 
 
 
 
 
 
 
 
Notes receivable
 
5.6

 
5.6

 
—

 
5.6

 
—

Long-term debt
 
(1,428.4
)
 
(1,550.3
)
 
—

 
(1,550.3
)
 
—

 
 
 
 
 
 
 
 
 
 
 
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
)
 
—