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Derivative Financial Instruments
 6 Months Ended
Jun. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative Financial Instruments
Derivative Financial Instruments
From time to time, the Company seeks to offset its exposure to changing interest rates under its debt financing arrangements by entering into interest rate hedging contracts.
The following summarizes the amount of derivative instrument gains and losses reported in the Consolidated Statements of Comprehensive Income:
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
Cash Flow Hedges
2012
 
2013
 
2012
 
2013
Interest rate swaps
$
(0.8
)
 
$
1.0

 
$
(0.9
)
 
$
1.3


The following summarizes the location and fair values of derivative instruments on the Consolidated Balance Sheets:
Cash Flow Hedges
December 31,
2012
 
June 30,
2013
Interest rate swaps(1)
$
(4.0
)
 
$
(2.7
)
___________________________________________________________

(1)
Presented within Other long-term liabilities.
The Company's derivative contracts contain provisions that may require the Company or the counterparties to post collateral based upon the current fair value of the derivative contracts. As of June 30, 2013, the Company had posted collateral of $4.0 million related to its interest rate swap contracts.
The Company does not generally hold or issue derivative financial instruments for trading purposes. Interest rate swaps are intended to enable the Company to achieve a level of variable-rate and fixed-rate debt that limits interest rate exposure.