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Derivative Instruments (Tables)
12 Months Ended
Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair Value of Derivative Financial Instruments
The table below presents the fair value of derivative financial instruments, which are included in Other non-current liabilities in the consolidated balance sheets (in millions):
 
As of December 31,
 
2013
 
2012
Interest rate swap liability - floating to fixed rate
$
2.8

 
$
—