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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2014
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis
 
As of September 30, 2014
 
As of December 31, 2013
Investment in marketable equity securities
$
6.7

 
$
4.4

 
Other Fair Value Measurements
 
As of September 30, 2014
 
As of December 31, 2013
Senior unsecured notes
$
213.9

 
$
214.0