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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Summary of Components of AOCI

Accumulated other comprehensive income (loss) includes the cumulative gains and losses of derivative instruments that qualify as cash flow hedges. The following table provides a rollforward of accumulated other comprehensive income (loss) for the years ended December 31, 2014 and 2013 (in millions):

 

 

  

2014

 

 

2013

 

Accumulated other comprehensive income (loss) as of January 1,

  

$

0.2

  

 

$

—

  

Other comprehensive income (loss)

  

 

(3.8

) 

 

 

0.4

  

Income tax benefit (expense)

  

 

1.4

  

 

 

(0.2

) 

Other comprehensive income (loss), net of tax

  

 

(2.4

) 

 

 

0.2

  

Accumulated other comprehensive income (loss) as of December 31,

  

$

(2.2

) 

 

$

0.2