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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2016
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following table presents the fair values of an investment in marketable equity securities, classified as Level 1 and related to publicly traded stock of a non-U.S. company, recorded in Other assets, net in the accompanying Consolidated Balance Sheets (in millions):
 
As of March 31, 2016
 
As of December 31, 2015
Investment in marketable equity securities
$
6.2

 
$
6.5

Other Fair Value Measurements
The following table presents their fair value (in millions):
 
As of March 31, 2016
 
As of December 31, 2015
Senior unsecured notes
$
208.8

 
$
207.3