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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following table presents the fair value hierarchy for those assets measured at fair value on a recurring basis (in millions):
 
 
Quoted Prices in Active Markets for
Identical Assets (Level 1)
 
As of December 31,
 
2012
 
2011
Investment in marketable equity securities (1)
$
10.6

 
$
8.4

 
(1) 
Investment in marketable equity securities is recorded in Other assets, net in the accompanying Consolidated Balance Sheets.
Other Fair Value Measurements
The estimated fair value of our debt was as follows (in millions):
 
 
Quoted Prices in Active Markets for
Similar Instruments (Level 2)
 
As of December 31,
 
2012
 
2011
Senior unsecured notes
$
212.3

 
$
207.0